Tag General

Sir C. V. Raman: Raman effect and beyond

We Indians celebrate National Science Day on 28th February each year to mark the discovery of the Raman effect by Sir C. V. Raman. Some of Raman’s discoveries like the Raman effect (for which he was awarded the Nobel prize),...


Mendeley Reference Manager

Being involved in research means dealing with a lot of papers on a day to day basis. Be it reading them, organizing them, or referencing them we often face a perilous task. A collection of scores of pdf documents scattered...


Using GitHub for Academic Research

GitHub has become the go-to tool for software engineers across the world to keep their codes together and collaborate with each other. Being easy, seamless, and available on all the platforms makes it a brilliant choice indeed.


The scientific legacy of Thanu Padmanabhan

Prof. Thanu Padmanabhan, one of the stalwarts of theoretical physics, and a shining star of the Indian scientific community, left his mortal abode on the 17th of September this year. With a stellar career spanning over four decades, he has...


What is CosmicVarta?

CosmicVarta is a team effort where we all come together to discuss astronomy and related tools and ideas. Come join us on this journey!


Mendeley Reference Manager

Being involved in research means dealing with a lot of papers on a day to day basis. Be it reading them, organizing them, or referencing them we often face a perilous task. A collection of scores of pdf documents scattered...


Using GitHub for Academic Research

GitHub has become the go-to tool for software engineers across the world to keep their codes together and collaborate with each other. Being easy, seamless, and available on all the platforms makes it a brilliant choice indeed.


The scientific legacy of Thanu Padmanabhan

Prof. Thanu Padmanabhan, one of the stalwarts of theoretical physics, and a shining star of the Indian scientific community, left his mortal abode on the 17th of September this year. With a stellar career spanning over four decades, he has...


What is CosmicVarta?

CosmicVarta is a team effort where we all come together to discuss astronomy and related tools and ideas. Come join us on this journey!


Tag Thanu Padmanabhan

The scientific legacy of Thanu Padmanabhan

Prof. Thanu Padmanabhan, one of the stalwarts of theoretical physics, and a shining star of the Indian scientific community, left his mortal abode on the 17th of September this year. With a stellar career spanning over four decades, he has...


Tag solar wind

Anyway the plasma moves - it does really matter!

Light when seen correctly provides rich information on what happens in the cosmos. In this article, we showcase our work on identifying signatures of the solar wind in the solar chromosphere – far lower in the solar atmosphere than what...


Understanding the solar chromosphere through spectral lines

This article takes the reader through a journey of inferring the cosmos - specifically our dear neighbour Sun - through various properties of light. The journey meanders through our work on understanding solar chromospheric properties through spectral lines, and seems...


From Sun to Earth using Artificial Intelligence

The focus of this article is solar wind. I first take the reader through the theory & observations, and various properties of solar wind. Then, I take a detour through machine and deep learning which form the basis of our...


Tag deep learning

From Sun to Earth using Artificial Intelligence

The focus of this article is solar wind. I first take the reader through the theory & observations, and various properties of solar wind. Then, I take a detour through machine and deep learning which form the basis of our...


Tag neural networks

From Sun to Earth using Artificial Intelligence

The focus of this article is solar wind. I first take the reader through the theory & observations, and various properties of solar wind. Then, I take a detour through machine and deep learning which form the basis of our...


Tag source regions

From Sun to Earth using Artificial Intelligence

The focus of this article is solar wind. I first take the reader through the theory & observations, and various properties of solar wind. Then, I take a detour through machine and deep learning which form the basis of our...


Tag Variable stars

Twinkle twinkle little stars, should I wonder what you are? A brief account of variable stars

Curiosity is what has driven mankind to observations of new phenomena. Every twinkling star in the night sky is definitely not due to the atmospheric refraction of earth. Rather, one might be looking at a variable star, each with a...


Tag transient events

Twinkle twinkle little stars, should I wonder what you are? A brief account of variable stars

Curiosity is what has driven mankind to observations of new phenomena. Every twinkling star in the night sky is definitely not due to the atmospheric refraction of earth. Rather, one might be looking at a variable star, each with a...


Tag Light Curve

Twinkle twinkle little stars, should I wonder what you are? A brief account of variable stars

Curiosity is what has driven mankind to observations of new phenomena. Every twinkling star in the night sky is definitely not due to the atmospheric refraction of earth. Rather, one might be looking at a variable star, each with a...


Tag Sun; Differential Rotation; NSSL; Theory

The First Theoretical Model of the Near-Surface Shear Layer of the Sun

It is well known that the Sun rotates differentially, i.e. its equator rotates faster than the pole. Not only at the surface, but the solar rotation profile also varies with the radius, which was discovered in helioseismic observation. This observation...


Tag Exoplanets

Polarization of the light reflected from exoplanets: A new window into the study of exoplanets

Polarization is an emerging technique in the field of exoplanets. Understanding the basic physics behind the polarization of the light observed from the planets can help us study them in detail. One such aspect is to study the polarization of...


Tag Polarization

Polarization of the light reflected from exoplanets: A new window into the study of exoplanets

Polarization is an emerging technique in the field of exoplanets. Understanding the basic physics behind the polarization of the light observed from the planets can help us study them in detail. One such aspect is to study the polarization of...


Tag Planetary atmospheres

Polarization of the light reflected from exoplanets: A new window into the study of exoplanets

Polarization is an emerging technique in the field of exoplanets. Understanding the basic physics behind the polarization of the light observed from the planets can help us study them in detail. One such aspect is to study the polarization of...


Tag Phase curves

Polarization of the light reflected from exoplanets: A new window into the study of exoplanets

Polarization is an emerging technique in the field of exoplanets. Understanding the basic physics behind the polarization of the light observed from the planets can help us study them in detail. One such aspect is to study the polarization of...


Tag solar

Technical aspects of VELC onboard ADITYA-L1: India’s first solar space mission

This article is the review of a journal paper on the Visible Emission Line Coronagraph, the primary payload onboard India’s first solar space mission, ADITYA-L1. The paper discusses some technical details of VELC and the work done in analyzing them....


Tag instrumentation

Technical aspects of VELC onboard ADITYA-L1: India’s first solar space mission

This article is the review of a journal paper on the Visible Emission Line Coronagraph, the primary payload onboard India’s first solar space mission, ADITYA-L1. The paper discusses some technical details of VELC and the work done in analyzing them....


Tag solar corona

Technical aspects of VELC onboard ADITYA-L1: India’s first solar space mission

This article is the review of a journal paper on the Visible Emission Line Coronagraph, the primary payload onboard India’s first solar space mission, ADITYA-L1. The paper discusses some technical details of VELC and the work done in analyzing them....


Tag ADITYA

Technical aspects of VELC onboard ADITYA-L1: India’s first solar space mission

This article is the review of a journal paper on the Visible Emission Line Coronagraph, the primary payload onboard India’s first solar space mission, ADITYA-L1. The paper discusses some technical details of VELC and the work done in analyzing them....


Tag VELC

Magnetic Field Measurements of the Solar Corona by Aditya L1

One of the science goals of the Aditya L1 is to map the coronal magnetic field topology. The infrared channel of the VELC payload of the Aditya L1 is equipped with a spectropolarimeter to perform full stokes spectropolarimetric observations in...


Technical aspects of VELC onboard ADITYA-L1: India’s first solar space mission

This article is the review of a journal paper on the Visible Emission Line Coronagraph, the primary payload onboard India’s first solar space mission, ADITYA-L1. The paper discusses some technical details of VELC and the work done in analyzing them....


Tag spectroscopy

Technical aspects of VELC onboard ADITYA-L1: India’s first solar space mission

This article is the review of a journal paper on the Visible Emission Line Coronagraph, the primary payload onboard India’s first solar space mission, ADITYA-L1. The paper discusses some technical details of VELC and the work done in analyzing them....


Tag multi-slit

Technical aspects of VELC onboard ADITYA-L1: India’s first solar space mission

This article is the review of a journal paper on the Visible Emission Line Coronagraph, the primary payload onboard India’s first solar space mission, ADITYA-L1. The paper discusses some technical details of VELC and the work done in analyzing them....


Tag Statistical methods

Identification of a new category of stars: stars in rare transition phase found

Pre-main-sequence (PMS) stars evolve into the main-sequence (MS) phase over a period of time. Interestingly, we found a scarcity of studies in the existing literature that examine and attempt to better understand the stars in the PMS to MS transition...


Tag Photometric techniques

Identification of a new category of stars: stars in rare transition phase found

Pre-main-sequence (PMS) stars evolve into the main-sequence (MS) phase over a period of time. Interestingly, we found a scarcity of studies in the existing literature that examine and attempt to better understand the stars in the PMS to MS transition...


Tag Emission-line stars

Identifying emission-line stars from a large spectroscopic database

We present a catalog of 3339 hot emission-line stars (ELS) identified from 451,695 O, B, and A type spectra, provided by the LAMOST DR5 release. We developed an automated python routine that identified 5437 spectra having a peak between 6561...


Identification of a new category of stars: stars in rare transition phase found

Pre-main-sequence (PMS) stars evolve into the main-sequence (MS) phase over a period of time. Interestingly, we found a scarcity of studies in the existing literature that examine and attempt to better understand the stars in the PMS to MS transition...


Tag Be stars

Identification of a new category of stars: stars in rare transition phase found

Pre-main-sequence (PMS) stars evolve into the main-sequence (MS) phase over a period of time. Interestingly, we found a scarcity of studies in the existing literature that examine and attempt to better understand the stars in the PMS to MS transition...


Tag Evolution

Identification of a new category of stars: stars in rare transition phase found

Pre-main-sequence (PMS) stars evolve into the main-sequence (MS) phase over a period of time. Interestingly, we found a scarcity of studies in the existing literature that examine and attempt to better understand the stars in the PMS to MS transition...


Tag Spectropolarimeter

Magnetic Field Measurements of the Solar Corona by Aditya L1

One of the science goals of the Aditya L1 is to map the coronal magnetic field topology. The infrared channel of the VELC payload of the Aditya L1 is equipped with a spectropolarimeter to perform full stokes spectropolarimetric observations in...


Tag Aditya-L1

Aditya-L1: India's Array of Instruments on a Journey Closer to the Sun, Continuing a Legacy of Space Excellence

The Sun has fascinated mankind since the dawn of civilization. From famines to fertile farms, every aspect of life on Earth was defined by it. Unaware of the true nature of the Sun, humans have worshipped this mighty celestial being...


Magnetic Field Measurements of the Solar Corona by Aditya L1

One of the science goals of the Aditya L1 is to map the coronal magnetic field topology. The infrared channel of the VELC payload of the Aditya L1 is equipped with a spectropolarimeter to perform full stokes spectropolarimetric observations in...


Tag stars

Fantastic beasts and where to find them: the elusive nature of X-ray quiet black holes

With the gravitational wave observations capturing the coalescence of compact objects, hunting for black holes has taken quite a front-row seat in astronomical observations. Here, we discuss two such detection of black holes in orbit with a main sequence companion,...


Classical Ae stars: What are they? Why study them?

Starting from the history of star classification in the millinniums, this interesting note will take you through some of the very basic concepts on emission-line stars. You will be able to understand what they are and why these type of...


Most Extreme Stars

A general article exploring some of the most extreme stars of the universe. Each one of them deserves the word ‘most’ for varied reasons. Just read and enjoy the mysterious cosmos sitting at home.


Tag Gravitational waves

Gravitational Waves in an Inhomogeneous Universe

Space is quite inhomogeneous at small scales. These inhomogeneities may play a significant role in governing the physical phenomena at this scale. Here we have analysed the impact of these inhomogeneities on the Gravitational Wave (GW) observables. For this analysis...


Futuristic gravitational wave observations to resolve dichotomy of compact objects

Gravitational waves are invisible ripples in space travel at the speed of light. It is generated in different scenarios, such as when two celestial bodies orbit around each other, an isolated body with tri-axial symmetry spins, inhomogeneity in matter distribution...


Tag Neutron Stars

Insight into the pulsar emmision mechanism using subpulse drifting: Subpulse drifting in PSR J1822−2256

Long after humans figured out that the small bright dots in the night sky were just another sun-like object, and not very long after the discovery of the neutron, in the year 1933, Baade and Zwicky theorized the existence of...


General Relativity And Its Effect On A Deformed And Misaligned Pulsar

Observed pulsars are misaligned in nature. The misalignment scenario occurs when the rotation axis and the magnetic axis of the star forms a finite non-zero angle between them. This scenario gives rise to very interesting phenomenons. This article explores such...


Understanding the evolution of the binary star system ‘Cen X-3’: New measurements of the spin and orbital parameters of the system

Researchers from Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, present the new measurements of the spin and orbital parameters of the binary star system ‘Cen X-3’. This work is a step forward in understanding the complex dynamics of the...


How strong is a neutron star's magnetic field?

Estimating the strength of the magnetic field of a neutron star in a binary star system ‘Cen X-3’


Futuristic gravitational wave observations to resolve dichotomy of compact objects

Gravitational waves are invisible ripples in space travel at the speed of light. It is generated in different scenarios, such as when two celestial bodies orbit around each other, an isolated body with tri-axial symmetry spins, inhomogeneity in matter distribution...


Tag White dwarfs

Futuristic gravitational wave observations to resolve dichotomy of compact objects

Gravitational waves are invisible ripples in space travel at the speed of light. It is generated in different scenarios, such as when two celestial bodies orbit around each other, an isolated body with tri-axial symmetry spins, inhomogeneity in matter distribution...


One year of CosmicVarta

CosmicVarta celebrates its first birthday today! Hurray! It was a wonderful year indeed. Today, we take a look back at our journey and briefly talk about our future plans.


Bengaluru: The Astronomy City

As part of the National Science day celebrations, the Indian Institute of Astrophysics organised a panel discussion titled- Bengaluru The Astronomy City. The focus of the meeting was to educate the young students regarding various opportunities in astronomy and astrophysics...


A list of scholarships for women in Science

A significant fraction of the advances in science and technology arises due to seminal contributions by women - all the while tackling a series of battles against social norms and skewed opportunities. Even today, there exists a lack of representation...


Voices of the Women in Science - A list of books on women scientists

Progress is possible only when everyone capable of contributing is given an equal chance irrespective of gender, community and nationality. While there is a long way to go before this gap is fulfilled, it should be noted that we as...


Measuring the age of the Universe: An overview

A popular article exploring how the age of the Universe was calculated.


Tag age_of_universe

Measuring the age of the Universe: An overview

A popular article exploring how the age of the Universe was calculated.


Tag big_bang

Measuring the age of the Universe: An overview

A popular article exploring how the age of the Universe was calculated.


Tag sun

Measuring the ages of the Earth and Moon

A popular article exploring how the ages of the Earth and Moon were measured.


Deciphering The Mysteries of The Quiet Sun Explosions

XSM onboard Chandrayaan 2 observed the Sun during its minimum activity period in 2019-2020. Using this data, the researchers have for the first time detected a very large number of small scale explosions, called microflares, happening on the Sun. The...


Tag corona

Measuring the ages of the Earth and Moon

A popular article exploring how the ages of the Earth and Moon were measured.


Deciphering The Mysteries of The Quiet Sun Explosions

XSM onboard Chandrayaan 2 observed the Sun during its minimum activity period in 2019-2020. Using this data, the researchers have for the first time detected a very large number of small scale explosions, called microflares, happening on the Sun. The...


Tag flares

Measuring the ages of the Earth and Moon

A popular article exploring how the ages of the Earth and Moon were measured.


Deciphering The Mysteries of The Quiet Sun Explosions

XSM onboard Chandrayaan 2 observed the Sun during its minimum activity period in 2019-2020. Using this data, the researchers have for the first time detected a very large number of small scale explosions, called microflares, happening on the Sun. The...


Tag x-ray

Measuring the ages of the Earth and Moon

A popular article exploring how the ages of the Earth and Moon were measured.


Deciphering The Mysteries of The Quiet Sun Explosions

XSM onboard Chandrayaan 2 observed the Sun during its minimum activity period in 2019-2020. Using this data, the researchers have for the first time detected a very large number of small scale explosions, called microflares, happening on the Sun. The...


Tag Pulsars

Insight into the pulsar emmision mechanism using subpulse drifting: Subpulse drifting in PSR J1822−2256

Long after humans figured out that the small bright dots in the night sky were just another sun-like object, and not very long after the discovery of the neutron, in the year 1933, Baade and Zwicky theorized the existence of...


General Relativity And Its Effect On A Deformed And Misaligned Pulsar

Observed pulsars are misaligned in nature. The misalignment scenario occurs when the rotation axis and the magnetic axis of the star forms a finite non-zero angle between them. This scenario gives rise to very interesting phenomenons. This article explores such...


Understanding the evolution of the binary star system ‘Cen X-3’: New measurements of the spin and orbital parameters of the system

Researchers from Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, present the new measurements of the spin and orbital parameters of the binary star system ‘Cen X-3’. This work is a step forward in understanding the complex dynamics of the...


How strong is a neutron star's magnetic field?

Estimating the strength of the magnetic field of a neutron star in a binary star system ‘Cen X-3’


Tag Galaxies

Looking at five radio-quiet AGN through the polarization lens

This article discusses the results from our combined radio polarization and emission line study of five type-2 radio-quiet quasars. We investigate the origin of radio emission in these sources and understand what impact the local gaseous environments have on the...


A comparison of the properties of Narrow Line and the Broad Line Seyfert galaxies

AGNs are very luminous objects at the centre of active galaxies. The inner regions of these galaxies can not be resolved directly, yet the understanding of these regions can be achieved by employing indirect methods. In this study, we employed...


What makes radio-quiet AGN radio-quiet? A polarization perspective

There is a lack of consensus on the origin of radio emission in radio-quiet (RQ) and radio-intermediate (RI) AGN. Primary contenders include low-power radio jets, winds, star-formation and coronal emission. Our multi-frequency, multi-scale radio polarization study has revealed a multi-component...


Star-forming S0 Galaxies in SDSS-MaNGA: fading spirals or rejuvenated S0s?

Galaxies are the building blocks of our universe. A comprehensive theory of how galaxies evolve with cosmic time is key to understanding how the universe turns out the way it is today. Decades of observational, theoretical and computational efforts have...


Bending of Cosmic fountains, giving birth to a peculiar X-shaped galaxy

When observed with a radio telescope, a giant peculiar X-shaped morphology is seen in some galaxies. It is difficult to understand what gives rise to such peculiar morphology; And, to date, this is a topic of debate among astronomers themselves....


Bar Buckling and Boxy/Peanut Bulges as the Tracer of Dark Matter Halo Shape

Galaxies reside in the deep potential of invisible matter called dark matter. Their dynamics is significantly affected by the distribution of dark matter around them. Distribution of dark matter around galaxies is usually known as dark matter halo. Most of...


Tag Bar Buckling

Bar Buckling and Boxy/Peanut Bulges as the Tracer of Dark Matter Halo Shape

Galaxies reside in the deep potential of invisible matter called dark matter. Their dynamics is significantly affected by the distribution of dark matter around them. Distribution of dark matter around galaxies is usually known as dark matter halo. Most of...


Tag Boxy/Peanut shape bulges

Bar Buckling and Boxy/Peanut Bulges as the Tracer of Dark Matter Halo Shape

Galaxies reside in the deep potential of invisible matter called dark matter. Their dynamics is significantly affected by the distribution of dark matter around them. Distribution of dark matter around galaxies is usually known as dark matter halo. Most of...


Tag Solar physics

Using machine learning to infer Solar coronal heating

This article traces the origins of the coronal heating problem, and describes in vivid detail our efforts in resolving this through machine learning. This is a non-technical article based on our paper, but references have been appended for the interested...


Tag machine learning

Using machine learning to infer Solar coronal heating

This article traces the origins of the coronal heating problem, and describes in vivid detail our efforts in resolving this through machine learning. This is a non-technical article based on our paper, but references have been appended for the interested...


Tag coronal heating

Anyway the plasma moves - it does really matter!

Light when seen correctly provides rich information on what happens in the cosmos. In this article, we showcase our work on identifying signatures of the solar wind in the solar chromosphere – far lower in the solar atmosphere than what...


Using machine learning to infer Solar coronal heating

This article traces the origins of the coronal heating problem, and describes in vivid detail our efforts in resolving this through machine learning. This is a non-technical article based on our paper, but references have been appended for the interested...


Tag Cosmology

India’s expanding Cosmology community

‘Frontiers in Cosmology’ was a five-day international conference held at Raman Research Institute (RRI) during February 20 – 24, 2023. More than 100 participants including researchers, scientists, students and faculties from around the world attended the meet.


Exploring the topology of hydrogen distribution in the early universe

We study how galaxies and other sources in the early universe change the neutral universe or InterGalactic Medium (IGM) into the ionized one. We compare different kinds of source models and how they ionize the neutral universe which mainly consists...


Gravitational Waves in an Inhomogeneous Universe

Space is quite inhomogeneous at small scales. These inhomogeneities may play a significant role in governing the physical phenomena at this scale. Here we have analysed the impact of these inhomogeneities on the Gravitational Wave (GW) observables. For this analysis...


SARAS 3 telescope refutes astrophysical origins of the claimed cosmic dawn signal

SARAS 3 experiment, designed and developed at Raman Research Institute, has conclusively refuted the claim of detection of the signal from cosmic dawn by EDGES experiment. It has become the first experiment worldwide to reach the required sensitivity and cross-verify...


Mass of the Black Hole in the nearby AGN: Mrk 590

Most of the massive galaxies in the Universe host a supermassive black hole (SMBH) at their center. A minority among them are known as active galaxies and host active galactic nuclei (AGNs). These AGN are believed to be powered by...


Shedding Light on the Cosmic Web with Fast Radio Bursts

Fast Radio Bursts are millisecond-duration radio transients of extragalactic origin. Their dispersion measures are sensitive to the presence of ionized matter along their lines of sight. This unique measurable makes FRBs a promising cosmological probe that can shed light on...


Tag Fast Radio Bursts

Mass of the Black Hole in the nearby AGN: Mrk 590

Most of the massive galaxies in the Universe host a supermassive black hole (SMBH) at their center. A minority among them are known as active galaxies and host active galactic nuclei (AGNs). These AGN are believed to be powered by...


Shedding Light on the Cosmic Web with Fast Radio Bursts

Fast Radio Bursts are millisecond-duration radio transients of extragalactic origin. Their dispersion measures are sensitive to the presence of ionized matter along their lines of sight. This unique measurable makes FRBs a promising cosmological probe that can shed light on...


Tag Galaxy dark matter halos

Mass of the Black Hole in the nearby AGN: Mrk 590

Most of the massive galaxies in the Universe host a supermassive black hole (SMBH) at their center. A minority among them are known as active galaxies and host active galactic nuclei (AGNs). These AGN are believed to be powered by...


Shedding Light on the Cosmic Web with Fast Radio Bursts

Fast Radio Bursts are millisecond-duration radio transients of extragalactic origin. Their dispersion measures are sensitive to the presence of ionized matter along their lines of sight. This unique measurable makes FRBs a promising cosmological probe that can shed light on...


Tag Radio transient sources

Mass of the Black Hole in the nearby AGN: Mrk 590

Most of the massive galaxies in the Universe host a supermassive black hole (SMBH) at their center. A minority among them are known as active galaxies and host active galactic nuclei (AGNs). These AGN are believed to be powered by...


Shedding Light on the Cosmic Web with Fast Radio Bursts

Fast Radio Bursts are millisecond-duration radio transients of extragalactic origin. Their dispersion measures are sensitive to the presence of ionized matter along their lines of sight. This unique measurable makes FRBs a promising cosmological probe that can shed light on...


Tag Quasar absorption line spectroscopy

Mass of the Black Hole in the nearby AGN: Mrk 590

Most of the massive galaxies in the Universe host a supermassive black hole (SMBH) at their center. A minority among them are known as active galaxies and host active galactic nuclei (AGNs). These AGN are believed to be powered by...


Shedding Light on the Cosmic Web with Fast Radio Bursts

Fast Radio Bursts are millisecond-duration radio transients of extragalactic origin. Their dispersion measures are sensitive to the presence of ionized matter along their lines of sight. This unique measurable makes FRBs a promising cosmological probe that can shed light on...


Tag emission-line

Classical Ae stars: What are they? Why study them?

Starting from the history of star classification in the millinniums, this interesting note will take you through some of the very basic concepts on emission-line stars. You will be able to understand what they are and why these type of...


Tag circumstellar matter

Classical Ae stars: What are they? Why study them?

Starting from the history of star classification in the millinniums, this interesting note will take you through some of the very basic concepts on emission-line stars. You will be able to understand what they are and why these type of...


Tag women-in science

A list of scholarships for women in Science

A significant fraction of the advances in science and technology arises due to seminal contributions by women - all the while tackling a series of battles against social norms and skewed opportunities. Even today, there exists a lack of representation...


Voices of the Women in Science - A list of books on women scientists

Progress is possible only when everyone capable of contributing is given an equal chance irrespective of gender, community and nationality. While there is a long way to go before this gap is fulfilled, it should be noted that we as...


Tag Astrobiology

Astrobiology: Exploring the universe for signs of extra-terrestrial life

The only life forms we know about are the ones that exist on Earth. Due to advancements in space exploration, it has become possible to send rovers, probes, space crafts, and telescopes in further deep space. With the help of...


Tag Solar chromosphere

Understanding the solar chromosphere through spectral lines

This article takes the reader through a journey of inferring the cosmos - specifically our dear neighbour Sun - through various properties of light. The journey meanders through our work on understanding solar chromospheric properties through spectral lines, and seems...


Tag spectral lines

Anyway the plasma moves - it does really matter!

Light when seen correctly provides rich information on what happens in the cosmos. In this article, we showcase our work on identifying signatures of the solar wind in the solar chromosphere – far lower in the solar atmosphere than what...


Understanding the solar chromosphere through spectral lines

This article takes the reader through a journey of inferring the cosmos - specifically our dear neighbour Sun - through various properties of light. The journey meanders through our work on understanding solar chromospheric properties through spectral lines, and seems...


Sir C. V. Raman: Raman effect and beyond

We Indians celebrate National Science Day on 28th February each year to mark the discovery of the Raman effect by Sir C. V. Raman. Some of Raman’s discoveries like the Raman effect (for which he was awarded the Nobel prize),...


Tag Indian National Science Day

Sir C. V. Raman: Raman effect and beyond

We Indians celebrate National Science Day on 28th February each year to mark the discovery of the Raman effect by Sir C. V. Raman. Some of Raman’s discoveries like the Raman effect (for which he was awarded the Nobel prize),...


Tag Catalog

Identifying emission-line stars from a large spectroscopic database

We present a catalog of 3339 hot emission-line stars (ELS) identified from 451,695 O, B, and A type spectra, provided by the LAMOST DR5 release. We developed an automated python routine that identified 5437 spectra having a peak between 6561...


Tag radio astronomy

EARTH-SIZED TELESCOPES FOR ASTRONOMICAL OBSERVATIONS IN THE LOW RADIO FREQUENCIES

The study of the cosmos is only complete when we can receive and analyse data from the entire electromagnetic spectrum, ranging from picometer-sized gamma rays to several meters long radio waves. This realization is what led to the advent of...


Tag radio interferometers

EARTH-SIZED TELESCOPES FOR ASTRONOMICAL OBSERVATIONS IN THE LOW RADIO FREQUENCIES

The study of the cosmos is only complete when we can receive and analyse data from the entire electromagnetic spectrum, ranging from picometer-sized gamma rays to several meters long radio waves. This realization is what led to the advent of...


Tag space telescopes

EARTH-SIZED TELESCOPES FOR ASTRONOMICAL OBSERVATIONS IN THE LOW RADIO FREQUENCIES

The study of the cosmos is only complete when we can receive and analyse data from the entire electromagnetic spectrum, ranging from picometer-sized gamma rays to several meters long radio waves. This realization is what led to the advent of...


Tag very long baseline interferometry

EARTH-SIZED TELESCOPES FOR ASTRONOMICAL OBSERVATIONS IN THE LOW RADIO FREQUENCIES

The study of the cosmos is only complete when we can receive and analyse data from the entire electromagnetic spectrum, ranging from picometer-sized gamma rays to several meters long radio waves. This realization is what led to the advent of...


Tag artificial satellites

EARTH-SIZED TELESCOPES FOR ASTRONOMICAL OBSERVATIONS IN THE LOW RADIO FREQUENCIES

The study of the cosmos is only complete when we can receive and analyse data from the entire electromagnetic spectrum, ranging from picometer-sized gamma rays to several meters long radio waves. This realization is what led to the advent of...


Tag space observatories

EARTH-SIZED TELESCOPES FOR ASTRONOMICAL OBSERVATIONS IN THE LOW RADIO FREQUENCIES

The study of the cosmos is only complete when we can receive and analyse data from the entire electromagnetic spectrum, ranging from picometer-sized gamma rays to several meters long radio waves. This realization is what led to the advent of...


Tag low frequency radio

EARTH-SIZED TELESCOPES FOR ASTRONOMICAL OBSERVATIONS IN THE LOW RADIO FREQUENCIES

The study of the cosmos is only complete when we can receive and analyse data from the entire electromagnetic spectrum, ranging from picometer-sized gamma rays to several meters long radio waves. This realization is what led to the advent of...


Tag Sun

Aditya-L1: India's Array of Instruments on a Journey Closer to the Sun, Continuing a Legacy of Space Excellence

The Sun has fascinated mankind since the dawn of civilization. From famines to fertile farms, every aspect of life on Earth was defined by it. Unaware of the true nature of the Sun, humans have worshipped this mighty celestial being...


How much Metal does the Quiet Sun Corona contain?

XSM onboard Chandrayaan-2 observed the Sun during the deepest solar minimum of the past century from in 2019-2020. By studying the XSM spectra for the days when the Sun was very quiet, researchers have found that the abundances of all...


Tag Corona

How much Metal does the Quiet Sun Corona contain?

XSM onboard Chandrayaan-2 observed the Sun during the deepest solar minimum of the past century from in 2019-2020. By studying the XSM spectra for the days when the Sun was very quiet, researchers have found that the abundances of all...


Tag Chandrayaan-2

How much Metal does the Quiet Sun Corona contain?

XSM onboard Chandrayaan-2 observed the Sun during the deepest solar minimum of the past century from in 2019-2020. By studying the XSM spectra for the days when the Sun was very quiet, researchers have found that the abundances of all...


Tag Elemental abundances

How much Metal does the Quiet Sun Corona contain?

XSM onboard Chandrayaan-2 observed the Sun during the deepest solar minimum of the past century from in 2019-2020. By studying the XSM spectra for the days when the Sun was very quiet, researchers have found that the abundances of all...


Tag Radio jets

Bending of Cosmic fountains, giving birth to a peculiar X-shaped galaxy

When observed with a radio telescope, a giant peculiar X-shaped morphology is seen in some galaxies. It is difficult to understand what gives rise to such peculiar morphology; And, to date, this is a topic of debate among astronomers themselves....


Tag Magnetohydrodynamics

Why are some jets curved: presence of dancing blackholes?

A small percentage of the ejected hot plasma flows (the jets) from supermassive blackholes are observed to deviate from their intended path, resulting in unusual jetted morphologies. One of these peculiarities appears when the jet starts to dance /precess around...


Bending of Cosmic fountains, giving birth to a peculiar X-shaped galaxy

When observed with a radio telescope, a giant peculiar X-shaped morphology is seen in some galaxies. It is difficult to understand what gives rise to such peculiar morphology; And, to date, this is a topic of debate among astronomers themselves....


Tag Cosmic dawn

SARAS 3 telescope refutes astrophysical origins of the claimed cosmic dawn signal

SARAS 3 experiment, designed and developed at Raman Research Institute, has conclusively refuted the claim of detection of the signal from cosmic dawn by EDGES experiment. It has become the first experiment worldwide to reach the required sensitivity and cross-verify...


Tag SARAS

SARAS 3 telescope refutes astrophysical origins of the claimed cosmic dawn signal

SARAS 3 experiment, designed and developed at Raman Research Institute, has conclusively refuted the claim of detection of the signal from cosmic dawn by EDGES experiment. It has become the first experiment worldwide to reach the required sensitivity and cross-verify...


Tag EDGES

SARAS 3 telescope refutes astrophysical origins of the claimed cosmic dawn signal

SARAS 3 experiment, designed and developed at Raman Research Institute, has conclusively refuted the claim of detection of the signal from cosmic dawn by EDGES experiment. It has become the first experiment worldwide to reach the required sensitivity and cross-verify...


Tag solar atmosphere

Anyway the plasma moves - it does really matter!

Light when seen correctly provides rich information on what happens in the cosmos. In this article, we showcase our work on identifying signatures of the solar wind in the solar chromosphere – far lower in the solar atmosphere than what...


Tag switchbacks

Anyway the plasma moves - it does really matter!

Light when seen correctly provides rich information on what happens in the cosmos. In this article, we showcase our work on identifying signatures of the solar wind in the solar chromosphere – far lower in the solar atmosphere than what...


Tag Accretion

Using a pseudo-Kerr formalism to study accretion and wind flows around rotating black holes

Hydrodynamic flows around black holes is a fascinating area of research that provides a window into the processes that power relativistic jets and energetic particle acceleration. However, this is a challenging task when studied using the full general relativistic framework....


Understanding the emissions in Black hole binaries

Yash Bhargava from Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, takes us through the journey of the death of a star in this wonderful article about his work.


Tag Accretion discs

Understanding the emissions in Black hole binaries

Yash Bhargava from Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, takes us through the journey of the death of a star in this wonderful article about his work.


Tag Black hole physics

Understanding the emissions in Black hole binaries

Yash Bhargava from Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, takes us through the journey of the death of a star in this wonderful article about his work.


Tag X-rays

Understanding the emissions in Black hole binaries

Yash Bhargava from Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, takes us through the journey of the death of a star in this wonderful article about his work.


Tag X-ray binaries

Understanding the emissions in Black hole binaries

Yash Bhargava from Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, takes us through the journey of the death of a star in this wonderful article about his work.


Tag polarization; clouds; ISM; proper motion; GAIA

Clouds’ Motion entangled by Magnetic Fields in Cepheus Flare

Stars take birth in molecular clouds. The presence of magnetic fields everywhere in the universe naturally creates a curiosity to investigate their role at all the stages of star fomation. The motion of clouds through the interstellar medium in the...


Tag Moon

The International Moon Day

On account of International Moon Day, we present a brief overview of the formation scenarios of the Moon. We also discuss the findings of Chandrayaan.


Tag International Moon Day

The International Moon Day

On account of International Moon Day, we present a brief overview of the formation scenarios of the Moon. We also discuss the findings of Chandrayaan.


Tag Chandrayaan

Chandrayaan-3 : A 14 day lunar cruise

India’s ambitious space program reaches new heights as Chandrayaan-3, the eagerly anticipated lunar exploration mission, prepares for launch. Get ready to witness history in the making as India embarks again on an extraordinary journey towards the Moon, marking a remarkable...


The International Moon Day

On account of International Moon Day, we present a brief overview of the formation scenarios of the Moon. We also discuss the findings of Chandrayaan.


Tag FIP effect

Evolution of plasma parameters during B class flares

In this article, we presented the temporal evolution of elemental abundances during solar flares of GOES B1−B4 class, the weakest events for which such studies have been possible so far, using observations with XSM on board Chandrayaan-2. This study was...


Tag FIP bias

Evolution of plasma parameters during B class flares

In this article, we presented the temporal evolution of elemental abundances during solar flares of GOES B1−B4 class, the weakest events for which such studies have been possible so far, using observations with XSM on board Chandrayaan-2. This study was...


Tag solar flares

Evolution of plasma parameters during B class flares

In this article, we presented the temporal evolution of elemental abundances during solar flares of GOES B1−B4 class, the weakest events for which such studies have been possible so far, using observations with XSM on board Chandrayaan-2. This study was...


Tag abundance

Evolution of plasma parameters during B class flares

In this article, we presented the temporal evolution of elemental abundances during solar flares of GOES B1−B4 class, the weakest events for which such studies have been possible so far, using observations with XSM on board Chandrayaan-2. This study was...


Tag XSM

Evolution of plasma parameters during B class flares

In this article, we presented the temporal evolution of elemental abundances during solar flares of GOES B1−B4 class, the weakest events for which such studies have been possible so far, using observations with XSM on board Chandrayaan-2. This study was...


Tag X-ray spectroscopy

Evolution of plasma parameters during B class flares

In this article, we presented the temporal evolution of elemental abundances during solar flares of GOES B1−B4 class, the weakest events for which such studies have been possible so far, using observations with XSM on board Chandrayaan-2. This study was...


Tag gamma-ray burst

Revealing the nature of the brightest & explosive astronomical sources in the sky using 3.6m Devasthal Optical Telescope (DOT)

India has a long history of more than two decades of observations of optical counterparts of gamma-ray bursts (GRBs) using Indian meter-class telescopes like the 1.04m Sampurnanand Telescope (ST), 1.3m Devasthal Fast Optical Telescope (DFOT), 2m Himalayan Chandra Telescope (HCT),...


Tag GRB

Revealing the nature of the brightest & explosive astronomical sources in the sky using 3.6m Devasthal Optical Telescope (DOT)

India has a long history of more than two decades of observations of optical counterparts of gamma-ray bursts (GRBs) using Indian meter-class telescopes like the 1.04m Sampurnanand Telescope (ST), 1.3m Devasthal Fast Optical Telescope (DFOT), 2m Himalayan Chandra Telescope (HCT),...


Tag GRB 210205A

Revealing the nature of the brightest & explosive astronomical sources in the sky using 3.6m Devasthal Optical Telescope (DOT)

India has a long history of more than two decades of observations of optical counterparts of gamma-ray bursts (GRBs) using Indian meter-class telescopes like the 1.04m Sampurnanand Telescope (ST), 1.3m Devasthal Fast Optical Telescope (DFOT), 2m Himalayan Chandra Telescope (HCT),...


Tag AT2021any

Revealing the nature of the brightest & explosive astronomical sources in the sky using 3.6m Devasthal Optical Telescope (DOT)

India has a long history of more than two decades of observations of optical counterparts of gamma-ray bursts (GRBs) using Indian meter-class telescopes like the 1.04m Sampurnanand Telescope (ST), 1.3m Devasthal Fast Optical Telescope (DFOT), 2m Himalayan Chandra Telescope (HCT),...


Tag ZTF21aaeyldq

Revealing the nature of the brightest & explosive astronomical sources in the sky using 3.6m Devasthal Optical Telescope (DOT)

India has a long history of more than two decades of observations of optical counterparts of gamma-ray bursts (GRBs) using Indian meter-class telescopes like the 1.04m Sampurnanand Telescope (ST), 1.3m Devasthal Fast Optical Telescope (DFOT), 2m Himalayan Chandra Telescope (HCT),...


Tag Devasthal Optical Telescope

Revealing the nature of the brightest & explosive astronomical sources in the sky using 3.6m Devasthal Optical Telescope (DOT)

India has a long history of more than two decades of observations of optical counterparts of gamma-ray bursts (GRBs) using Indian meter-class telescopes like the 1.04m Sampurnanand Telescope (ST), 1.3m Devasthal Fast Optical Telescope (DFOT), 2m Himalayan Chandra Telescope (HCT),...


Tag DOT

Revealing the nature of the brightest & explosive astronomical sources in the sky using 3.6m Devasthal Optical Telescope (DOT)

India has a long history of more than two decades of observations of optical counterparts of gamma-ray bursts (GRBs) using Indian meter-class telescopes like the 1.04m Sampurnanand Telescope (ST), 1.3m Devasthal Fast Optical Telescope (DFOT), 2m Himalayan Chandra Telescope (HCT),...


Tag Stars

Core-collapse supernova from a possible progenitor star of 100 solar mass

Supernovae are extreme astrophysical transient phenomena marking the death of stars. In this article, I take you to the journey of the life of a star as massive as 100 times our sun. Through the state-of-the-art simulation tool MESA, we...


Tag Supernova

Astrophysical autopsy of a cosmic demise

As the saying goes, “न कंचित् शाश्वतम्” (lit. Nothing is permanent), and hence the nature of this universe. The ever-evolving twinkles in the starry night are also non-discriminate towards this concept. If a star is born, it ought to die....


Core-collapse supernova from a possible progenitor star of 100 solar mass

Supernovae are extreme astrophysical transient phenomena marking the death of stars. In this article, I take you to the journey of the life of a star as massive as 100 times our sun. Through the state-of-the-art simulation tool MESA, we...


Tag Blackholes

Why are some jets curved: presence of dancing blackholes?

A small percentage of the ejected hot plasma flows (the jets) from supermassive blackholes are observed to deviate from their intended path, resulting in unusual jetted morphologies. One of these peculiarities appears when the jet starts to dance /precess around...


Tag Jet precession

Why are some jets curved: presence of dancing blackholes?

A small percentage of the ejected hot plasma flows (the jets) from supermassive blackholes are observed to deviate from their intended path, resulting in unusual jetted morphologies. One of these peculiarities appears when the jet starts to dance /precess around...


Tag Shock acceleration

Why are some jets curved: presence of dancing blackholes?

A small percentage of the ejected hot plasma flows (the jets) from supermassive blackholes are observed to deviate from their intended path, resulting in unusual jetted morphologies. One of these peculiarities appears when the jet starts to dance /precess around...


Tag Radiation mechanisms

Why are some jets curved: presence of dancing blackholes?

A small percentage of the ejected hot plasma flows (the jets) from supermassive blackholes are observed to deviate from their intended path, resulting in unusual jetted morphologies. One of these peculiarities appears when the jet starts to dance /precess around...


Tag Active galaxies

Bending/Flipping/Reorienting: Superheated plasma outflow from supermassive blackhole producing ‘X’-like fountains

Embark on a cosmic journey as Gourab Giri explores the enigmatic X-shaped structures observed in radio galaxies, formed by the ejection of jets from supermassive black holes.


Why are some jets curved: presence of dancing blackholes?

A small percentage of the ejected hot plasma flows (the jets) from supermassive blackholes are observed to deviate from their intended path, resulting in unusual jetted morphologies. One of these peculiarities appears when the jet starts to dance /precess around...


Tag Jet-Galaxy interaction

Why are some jets curved: presence of dancing blackholes?

A small percentage of the ejected hot plasma flows (the jets) from supermassive blackholes are observed to deviate from their intended path, resulting in unusual jetted morphologies. One of these peculiarities appears when the jet starts to dance /precess around...


Tag Dual AGN

Why are some jets curved: presence of dancing blackholes?

A small percentage of the ejected hot plasma flows (the jets) from supermassive blackholes are observed to deviate from their intended path, resulting in unusual jetted morphologies. One of these peculiarities appears when the jet starts to dance /precess around...


Tag Young star clusters

How do astronomers understand the evolution of young stars in star clusters?

This article is based on the paper published in the Journal of Astrophysics & Astronomy. The article shows the results of our deep optical photometric observations of a young cluster NGC 1893 taken with the 3.6m Devasthal Optical Telescope. Based...


Tag stellar evolution

How do astronomers understand the evolution of young stars in star clusters?

This article is based on the paper published in the Journal of Astrophysics & Astronomy. The article shows the results of our deep optical photometric observations of a young cluster NGC 1893 taken with the 3.6m Devasthal Optical Telescope. Based...


Tag Initial Mass Function

How do astronomers understand the evolution of young stars in star clusters?

This article is based on the paper published in the Journal of Astrophysics & Astronomy. The article shows the results of our deep optical photometric observations of a young cluster NGC 1893 taken with the 3.6m Devasthal Optical Telescope. Based...


Tag early warning signals

The Great Dimming of Betelgeuse: A Stellar Tipping Point?

The Great Dimming of Betelgeuse (alpha Orionis) in late 2019 puzzled astronomers across the globe. The star appeared the faintest in all its modern recorded history. The mystery mounted as it quickly regained brightness in the next few months, and...


Tag stellar dynamics

The Great Dimming of Betelgeuse: A Stellar Tipping Point?

The Great Dimming of Betelgeuse (alpha Orionis) in late 2019 puzzled astronomers across the globe. The star appeared the faintest in all its modern recorded history. The mystery mounted as it quickly regained brightness in the next few months, and...


Tag dynamical systems

The Great Dimming of Betelgeuse: A Stellar Tipping Point?

The Great Dimming of Betelgeuse (alpha Orionis) in late 2019 puzzled astronomers across the globe. The star appeared the faintest in all its modern recorded history. The mystery mounted as it quickly regained brightness in the next few months, and...


Tag critical transition

The Great Dimming of Betelgeuse: A Stellar Tipping Point?

The Great Dimming of Betelgeuse (alpha Orionis) in late 2019 puzzled astronomers across the globe. The star appeared the faintest in all its modern recorded history. The mystery mounted as it quickly regained brightness in the next few months, and...


Tag SDSS

Star-forming S0 Galaxies in SDSS-MaNGA: fading spirals or rejuvenated S0s?

Galaxies are the building blocks of our universe. A comprehensive theory of how galaxies evolve with cosmic time is key to understanding how the universe turns out the way it is today. Decades of observational, theoretical and computational efforts have...


Tag MaNGA

Star-forming S0 Galaxies in SDSS-MaNGA: fading spirals or rejuvenated S0s?

Galaxies are the building blocks of our universe. A comprehensive theory of how galaxies evolve with cosmic time is key to understanding how the universe turns out the way it is today. Decades of observational, theoretical and computational efforts have...


Tag galaxy morphology

Star-forming S0 Galaxies in SDSS-MaNGA: fading spirals or rejuvenated S0s?

Galaxies are the building blocks of our universe. A comprehensive theory of how galaxies evolve with cosmic time is key to understanding how the universe turns out the way it is today. Decades of observational, theoretical and computational efforts have...


Tag S0

Star-forming S0 Galaxies in SDSS-MaNGA: fading spirals or rejuvenated S0s?

Galaxies are the building blocks of our universe. A comprehensive theory of how galaxies evolve with cosmic time is key to understanding how the universe turns out the way it is today. Decades of observational, theoretical and computational efforts have...


Tag PSR J1822−2256

Insight into the pulsar emmision mechanism using subpulse drifting: Subpulse drifting in PSR J1822−2256

Long after humans figured out that the small bright dots in the night sky were just another sun-like object, and not very long after the discovery of the neutron, in the year 1933, Baade and Zwicky theorized the existence of...


Tag Subpulse Drifting

Insight into the pulsar emmision mechanism using subpulse drifting: Subpulse drifting in PSR J1822−2256

Long after humans figured out that the small bright dots in the night sky were just another sun-like object, and not very long after the discovery of the neutron, in the year 1933, Baade and Zwicky theorized the existence of...


Tag Inhomogeneous universe

Gravitational Waves in an Inhomogeneous Universe

Space is quite inhomogeneous at small scales. These inhomogeneities may play a significant role in governing the physical phenomena at this scale. Here we have analysed the impact of these inhomogeneities on the Gravitational Wave (GW) observables. For this analysis...


Tag AGNs

Looking at five radio-quiet AGN through the polarization lens

This article discusses the results from our combined radio polarization and emission line study of five type-2 radio-quiet quasars. We investigate the origin of radio emission in these sources and understand what impact the local gaseous environments have on the...


A comparison of the properties of Narrow Line and the Broad Line Seyfert galaxies

AGNs are very luminous objects at the centre of active galaxies. The inner regions of these galaxies can not be resolved directly, yet the understanding of these regions can be achieved by employing indirect methods. In this study, we employed...


What makes radio-quiet AGN radio-quiet? A polarization perspective

There is a lack of consensus on the origin of radio emission in radio-quiet (RQ) and radio-intermediate (RI) AGN. Primary contenders include low-power radio jets, winds, star-formation and coronal emission. Our multi-frequency, multi-scale radio polarization study has revealed a multi-component...


Tag Blackhole

Looking at five radio-quiet AGN through the polarization lens

This article discusses the results from our combined radio polarization and emission line study of five type-2 radio-quiet quasars. We investigate the origin of radio emission in these sources and understand what impact the local gaseous environments have on the...


A comparison of the properties of Narrow Line and the Broad Line Seyfert galaxies

AGNs are very luminous objects at the centre of active galaxies. The inner regions of these galaxies can not be resolved directly, yet the understanding of these regions can be achieved by employing indirect methods. In this study, we employed...


What makes radio-quiet AGN radio-quiet? A polarization perspective

There is a lack of consensus on the origin of radio emission in radio-quiet (RQ) and radio-intermediate (RI) AGN. Primary contenders include low-power radio jets, winds, star-formation and coronal emission. Our multi-frequency, multi-scale radio polarization study has revealed a multi-component...


Tag Solar Physics

Precise Measurement of Flux Density of Radio Emissions from the Sun using Day-time Celestial Radio Sources

During astronomical observation, astronomers measure the amount of energy emitted by astronomical objects. This energy is generally measured in terms of the flux density of the source. At radio frequencies, these measurements are calibrated using calibrator sources, which have known...


Tag Solar Radio Physics

Precise Measurement of Flux Density of Radio Emissions from the Sun using Day-time Celestial Radio Sources

During astronomical observation, astronomers measure the amount of energy emitted by astronomical objects. This energy is generally measured in terms of the flux density of the source. At radio frequencies, these measurements are calibrated using calibrator sources, which have known...


Tag MWA

Precise Measurement of Flux Density of Radio Emissions from the Sun using Day-time Celestial Radio Sources

During astronomical observation, astronomers measure the amount of energy emitted by astronomical objects. This energy is generally measured in terms of the flux density of the source. At radio frequencies, these measurements are calibrated using calibrator sources, which have known...


Tag massive black holes

Fantastic beasts and where to find them: the elusive nature of X-ray quiet black holes

With the gravitational wave observations capturing the coalescence of compact objects, hunting for black holes has taken quite a front-row seat in astronomical observations. Here, we discuss two such detection of black holes in orbit with a main sequence companion,...


Tag binaries

Fantastic beasts and where to find them: the elusive nature of X-ray quiet black holes

With the gravitational wave observations capturing the coalescence of compact objects, hunting for black holes has taken quite a front-row seat in astronomical observations. Here, we discuss two such detection of black holes in orbit with a main sequence companion,...


Tag Active galactic nuclei; Radio loud quasars; Radio jets; Quasar absorption line spectroscopy

Astronomers find cold atomic gas playing peek-a-boo around a powerful quasar

The interaction of radio jets with gas associated with the host galaxy could play an important role in determining their morphology. Such interactions may be more prevalent at high redshifts, when these powerful AGN are still the assembly sites of...


Tag scicomm

Spreading the joy of science - The science outreach activities during the Young Astronomer’s Meeting, 2022

A summary of science outreach performed during the Young Astronomer’s Meeting, 2022.


Tag outreach

'Where’s the Shadow?' - A workshop in preparation for Zero Shadow Day

The Cosmology Education and Research Training Centre (COSMOS) is an upcoming state-of-the-art planetarium, along with a data training centre and resource centre in Mysuru. The Indian Institute of Astrophysics (IIA) has formed an Education and Public Outreach Committee (EPOC) for...


Spreading the joy of science - The science outreach activities during the Young Astronomer’s Meeting, 2022

A summary of science outreach performed during the Young Astronomer’s Meeting, 2022.


Tag conference

Spreading the joy of science - The science outreach activities during the Young Astronomer’s Meeting, 2022

A summary of science outreach performed during the Young Astronomer’s Meeting, 2022.


Tag Transients

Astrophysical autopsy of a cosmic demise

As the saying goes, “न कंचित् शाश्वतम्” (lit. Nothing is permanent), and hence the nature of this universe. The ever-evolving twinkles in the starry night are also non-discriminate towards this concept. If a star is born, it ought to die....


Tag Observations

Astrophysical autopsy of a cosmic demise

As the saying goes, “न कंचित् शाश्वतम्” (lit. Nothing is permanent), and hence the nature of this universe. The ever-evolving twinkles in the starry night are also non-discriminate towards this concept. If a star is born, it ought to die....


Tag Hydrodynamic Modelling

Astrophysical autopsy of a cosmic demise

As the saying goes, “न कंचित् शाश्वतम्” (lit. Nothing is permanent), and hence the nature of this universe. The ever-evolving twinkles in the starry night are also non-discriminate towards this concept. If a star is born, it ought to die....


Tag Epoch of Reionization

Exploring the topology of hydrogen distribution in the early universe

We study how galaxies and other sources in the early universe change the neutral universe or InterGalactic Medium (IGM) into the ionized one. We compare different kinds of source models and how they ionize the neutral universe which mainly consists...


Tag Largest Cluster Statistics

Exploring the topology of hydrogen distribution in the early universe

We study how galaxies and other sources in the early universe change the neutral universe or InterGalactic Medium (IGM) into the ionized one. We compare different kinds of source models and how they ionize the neutral universe which mainly consists...


Tag Percolation

Exploring the topology of hydrogen distribution in the early universe

We study how galaxies and other sources in the early universe change the neutral universe or InterGalactic Medium (IGM) into the ionized one. We compare different kinds of source models and how they ionize the neutral universe which mainly consists...


Tag Black Hole Physics

Using a pseudo-Kerr formalism to study accretion and wind flows around rotating black holes

Hydrodynamic flows around black holes is a fascinating area of research that provides a window into the processes that power relativistic jets and energetic particle acceleration. However, this is a challenging task when studied using the full general relativistic framework....


Tag Testing general relativity using gravitational waves

Can missing physics in gravitational waveforms mimic false violations of general relativity?

General theory of relativity proposed by Albert Einstein in 1915 has passed all the experimental and observational tests with flying colors. Gravitational waves from the merger of compact binaries such as black holes and neutron stars provide a unique opportunity...


Tag Neutron star crust

Nuclear Pasta in the crust of neutron star

The article discusses the structure of the neutron star crust. In the neutron star’s crust, exotic structures commonly known as “nuclear pasta” are believed to exist. The pasta structure impacts various structural, thermal and transport properties of the crust and...


Tag Pasta Structure

Nuclear Pasta in the crust of neutron star

The article discusses the structure of the neutron star crust. In the neutron star’s crust, exotic structures commonly known as “nuclear pasta” are believed to exist. The pasta structure impacts various structural, thermal and transport properties of the crust and...


Tag Solar cycle

Solar cycle 25 is going to be a bit stronger than cycle 24!

Forecasting the strength of the solar cycle is of the utmost importance because it affects space weather and our technology-based society. By a riveting feature of the solar cycles, i.e. Waldmeier effect (WE2), we find a linear relationship between the...


Tag Sunspot

Solar cycle 25 is going to be a bit stronger than cycle 24!

Forecasting the strength of the solar cycle is of the utmost importance because it affects space weather and our technology-based society. By a riveting feature of the solar cycles, i.e. Waldmeier effect (WE2), we find a linear relationship between the...


Tag Space weather

Solar cycle 25 is going to be a bit stronger than cycle 24!

Forecasting the strength of the solar cycle is of the utmost importance because it affects space weather and our technology-based society. By a riveting feature of the solar cycles, i.e. Waldmeier effect (WE2), we find a linear relationship between the...


Tag clagn

Why do some Active Galactic Nuclei Change their Look?

An active galactic nucleus (AGN) is powered by the matter accreting onto the central supermassive black hole (SMBH) at the centre of a galaxy. Changing look (CL) AGNs are those sources that show rapid change in the column density of...


Tag blackholes

Why do some Active Galactic Nuclei Change their Look?

An active galactic nucleus (AGN) is powered by the matter accreting onto the central supermassive black hole (SMBH) at the centre of a galaxy. Changing look (CL) AGNs are those sources that show rapid change in the column density of...


Tag Proceedings

India’s expanding Cosmology community

‘Frontiers in Cosmology’ was a five-day international conference held at Raman Research Institute (RRI) during February 20 – 24, 2023. More than 100 participants including researchers, scientists, students and faculties from around the world attended the meet.


Proceedings of the National Seminar on Advances in Astrophysics and Space Science Research (NSAAASSR) 2023

The Department of Physics and Electronics at CHRIST (Deemed to be University) in Bangalore, Karnataka, organised the National Seminar on Advances in Astrophysics and Space Science Research (NSAASSR) from February 13 to 15, 2023. The seminar was organised as part...


Tag seminar

Proceedings of the National Seminar on Advances in Astrophysics and Space Science Research (NSAAASSR) 2023

The Department of Physics and Electronics at CHRIST (Deemed to be University) in Bangalore, Karnataka, organised the National Seminar on Advances in Astrophysics and Space Science Research (NSAASSR) from February 13 to 15, 2023. The seminar was organised as part...


Tag national level seminar

Proceedings of the National Seminar on Advances in Astrophysics and Space Science Research (NSAAASSR) 2023

The Department of Physics and Electronics at CHRIST (Deemed to be University) in Bangalore, Karnataka, organised the National Seminar on Advances in Astrophysics and Space Science Research (NSAASSR) from February 13 to 15, 2023. The seminar was organised as part...


Tag International

XpoSat: India's venture into the new frontier of X-ray astronomy

The Indian Space Research Organisation (ISRO) commenced the new year with the launch of the X-Ray Polarimeter Satellite (XPoSat). X-ray polarization measurement is an emerging technique in X-ray astronomy and holds immense potential for enhancing our understanding of the extreme...


Aditya-L1: India's Array of Instruments on a Journey Closer to the Sun, Continuing a Legacy of Space Excellence

The Sun has fascinated mankind since the dawn of civilization. From famines to fertile farms, every aspect of life on Earth was defined by it. Unaware of the true nature of the Sun, humans have worshipped this mighty celestial being...


Chandrayaan-3 : A 14 day lunar cruise

India’s ambitious space program reaches new heights as Chandrayaan-3, the eagerly anticipated lunar exploration mission, prepares for launch. Get ready to witness history in the making as India embarks again on an extraordinary journey towards the Moon, marking a remarkable...


India’s expanding Cosmology community

‘Frontiers in Cosmology’ was a five-day international conference held at Raman Research Institute (RRI) during February 20 – 24, 2023. More than 100 participants including researchers, scientists, students and faculties from around the world attended the meet.


Tag Conference

India’s expanding Cosmology community

‘Frontiers in Cosmology’ was a five-day international conference held at Raman Research Institute (RRI) during February 20 – 24, 2023. More than 100 participants including researchers, scientists, students and faculties from around the world attended the meet.


Tag zeroshadowday

'Where’s the Shadow?' - A workshop in preparation for Zero Shadow Day

The Cosmology Education and Research Training Centre (COSMOS) is an upcoming state-of-the-art planetarium, along with a data training centre and resource centre in Mysuru. The Indian Institute of Astrophysics (IIA) has formed an Education and Public Outreach Committee (EPOC) for...


Tag COSMOS Mysuru

'Where’s the Shadow?' - A workshop in preparation for Zero Shadow Day

The Cosmology Education and Research Training Centre (COSMOS) is an upcoming state-of-the-art planetarium, along with a data training centre and resource centre in Mysuru. The Indian Institute of Astrophysics (IIA) has formed an Education and Public Outreach Committee (EPOC) for...


Tag India

XpoSat: India's venture into the new frontier of X-ray astronomy

The Indian Space Research Organisation (ISRO) commenced the new year with the launch of the X-Ray Polarimeter Satellite (XPoSat). X-ray polarization measurement is an emerging technique in X-ray astronomy and holds immense potential for enhancing our understanding of the extreme...


Aditya-L1: India's Array of Instruments on a Journey Closer to the Sun, Continuing a Legacy of Space Excellence

The Sun has fascinated mankind since the dawn of civilization. From famines to fertile farms, every aspect of life on Earth was defined by it. Unaware of the true nature of the Sun, humans have worshipped this mighty celestial being...


Chandrayaan-3 : A 14 day lunar cruise

India’s ambitious space program reaches new heights as Chandrayaan-3, the eagerly anticipated lunar exploration mission, prepares for launch. Get ready to witness history in the making as India embarks again on an extraordinary journey towards the Moon, marking a remarkable...


Tag ISRO

XpoSat: India's venture into the new frontier of X-ray astronomy

The Indian Space Research Organisation (ISRO) commenced the new year with the launch of the X-Ray Polarimeter Satellite (XPoSat). X-ray polarization measurement is an emerging technique in X-ray astronomy and holds immense potential for enhancing our understanding of the extreme...


Aditya-L1: India's Array of Instruments on a Journey Closer to the Sun, Continuing a Legacy of Space Excellence

The Sun has fascinated mankind since the dawn of civilization. From famines to fertile farms, every aspect of life on Earth was defined by it. Unaware of the true nature of the Sun, humans have worshipped this mighty celestial being...


Chandrayaan-3 : A 14 day lunar cruise

India’s ambitious space program reaches new heights as Chandrayaan-3, the eagerly anticipated lunar exploration mission, prepares for launch. Get ready to witness history in the making as India embarks again on an extraordinary journey towards the Moon, marking a remarkable...


Tag moon

Chandrayaan-3 : A 14 day lunar cruise

India’s ambitious space program reaches new heights as Chandrayaan-3, the eagerly anticipated lunar exploration mission, prepares for launch. Get ready to witness history in the making as India embarks again on an extraordinary journey towards the Moon, marking a remarkable...


Tag lunar exploration

Chandrayaan-3 : A 14 day lunar cruise

India’s ambitious space program reaches new heights as Chandrayaan-3, the eagerly anticipated lunar exploration mission, prepares for launch. Get ready to witness history in the making as India embarks again on an extraordinary journey towards the Moon, marking a remarkable...


Tag GRBs

The Ghost of a Star Screams 6 Days After Its Death

Dying heavy stars forms black holes and sometimes emit jets, producing very narrow-angle flashes of gamma rays known as Gamma-Ray Bursts (GRBs). This article summarises the findings from the follow-up of such a GRB 210204A. The GRB showed typical afterglow...


Tag Optical

The Ghost of a Star Screams 6 Days After Its Death

Dying heavy stars forms black holes and sometimes emit jets, producing very narrow-angle flashes of gamma rays known as Gamma-Ray Bursts (GRBs). This article summarises the findings from the follow-up of such a GRB 210204A. The GRB showed typical afterglow...


Tag Black Hole

The Ghost of a Star Screams 6 Days After Its Death

Dying heavy stars forms black holes and sometimes emit jets, producing very narrow-angle flashes of gamma rays known as Gamma-Ray Bursts (GRBs). This article summarises the findings from the follow-up of such a GRB 210204A. The GRB showed typical afterglow...


Tag Compact Objects

The Ghost of a Star Screams 6 Days After Its Death

Dying heavy stars forms black holes and sometimes emit jets, producing very narrow-angle flashes of gamma rays known as Gamma-Ray Bursts (GRBs). This article summarises the findings from the follow-up of such a GRB 210204A. The GRB showed typical afterglow...


Tag Active galactic nuclei

Origin of ultra-bright blazar emissions: An astronomer’s glimpse into cosmic volcanoes

Blazars are a rare class of active galactic nuclei (AGN), in which the jets are pointed directly toward our line of sight, making them one of the brightest yet extremely compact sources. Relativistic effects such as beaming makes the jet...


Tag jets

Origin of ultra-bright blazar emissions: An astronomer’s glimpse into cosmic volcanoes

Blazars are a rare class of active galactic nuclei (AGN), in which the jets are pointed directly toward our line of sight, making them one of the brightest yet extremely compact sources. Relativistic effects such as beaming makes the jet...


Tag blazars

Origin of ultra-bright blazar emissions: An astronomer’s glimpse into cosmic volcanoes

Blazars are a rare class of active galactic nuclei (AGN), in which the jets are pointed directly toward our line of sight, making them one of the brightest yet extremely compact sources. Relativistic effects such as beaming makes the jet...


Tag Solar exploration

Aditya-L1: India's Array of Instruments on a Journey Closer to the Sun, Continuing a Legacy of Space Excellence

The Sun has fascinated mankind since the dawn of civilization. From famines to fertile farms, every aspect of life on Earth was defined by it. Unaware of the true nature of the Sun, humans have worshipped this mighty celestial being...


Tag Galaxy Collision

Collisions between galaxies: A frequent phenomenon than we expected earlier

Initially, early-type galaxies were considered aged, evolved systems with a reddish appearance, primarily comprising older stars and lacking young star formation due to limited gas and dust resources. However, contemporary techniques, such as integral field spectroscopy for studying star motion...


Tag Galaxy Evolution

Collisions between galaxies: A frequent phenomenon than we expected earlier

Initially, early-type galaxies were considered aged, evolved systems with a reddish appearance, primarily comprising older stars and lacking young star formation due to limited gas and dust resources. However, contemporary techniques, such as integral field spectroscopy for studying star motion...


Tag Structures of Galaxy Mergers

Collisions between galaxies: A frequent phenomenon than we expected earlier

Initially, early-type galaxies were considered aged, evolved systems with a reddish appearance, primarily comprising older stars and lacking young star formation due to limited gas and dust resources. However, contemporary techniques, such as integral field spectroscopy for studying star motion...


Tag Galaxy Interaction Rate

Collisions between galaxies: A frequent phenomenon than we expected earlier

Initially, early-type galaxies were considered aged, evolved systems with a reddish appearance, primarily comprising older stars and lacking young star formation due to limited gas and dust resources. However, contemporary techniques, such as integral field spectroscopy for studying star motion...


Tag Extreme-ultraviolet polarimeter

Revealing the mysteries of the Sun's coronal Magnetic Field using high energy spectropolarimetry

This article explains the importance of the Sun’s coronal magnetic field. In view of this, this article elaborates the capability of spectral lines emitted in the extreme-ultraviolet and delineates the promising technique of the Hanle effect in deriving the coronal...


Tag Hanle effect

Revealing the mysteries of the Sun's coronal Magnetic Field using high energy spectropolarimetry

This article explains the importance of the Sun’s coronal magnetic field. In view of this, this article elaborates the capability of spectral lines emitted in the extreme-ultraviolet and delineates the promising technique of the Hanle effect in deriving the coronal...


Tag coronal magnetism

Revealing the mysteries of the Sun's coronal Magnetic Field using high energy spectropolarimetry

This article explains the importance of the Sun’s coronal magnetic field. In view of this, this article elaborates the capability of spectral lines emitted in the extreme-ultraviolet and delineates the promising technique of the Hanle effect in deriving the coronal...


Tag Plasma outflow

Bending/Flipping/Reorienting: Superheated plasma outflow from supermassive blackhole producing ‘X’-like fountains

Embark on a cosmic journey as Gourab Giri explores the enigmatic X-shaped structures observed in radio galaxies, formed by the ejection of jets from supermassive black holes.


Tag Supermassive blackhole

Bending/Flipping/Reorienting: Superheated plasma outflow from supermassive blackhole producing ‘X’-like fountains

Embark on a cosmic journey as Gourab Giri explores the enigmatic X-shaped structures observed in radio galaxies, formed by the ejection of jets from supermassive black holes.


Tag General Relativity and Quantum Cosmology

I-Love-C universal relation for the anisotropic neutron stars

The neutron star is the most well known compact object in the Universe. It has several macroscopic properties such as mass (M), radius (R), compactness (C), tidal deformability (Λ), and moment of inertia (I), which can be observed using different...


Tag Nuclear Theory

I-Love-C universal relation for the anisotropic neutron stars

The neutron star is the most well known compact object in the Universe. It has several macroscopic properties such as mass (M), radius (R), compactness (C), tidal deformability (Λ), and moment of inertia (I), which can be observed using different...


Tag XPoSat

XpoSat: India's venture into the new frontier of X-ray astronomy

The Indian Space Research Organisation (ISRO) commenced the new year with the launch of the X-Ray Polarimeter Satellite (XPoSat). X-ray polarization measurement is an emerging technique in X-ray astronomy and holds immense potential for enhancing our understanding of the extreme...


Tag pulsars

XpoSat: India's venture into the new frontier of X-ray astronomy

The Indian Space Research Organisation (ISRO) commenced the new year with the launch of the X-Ray Polarimeter Satellite (XPoSat). X-ray polarization measurement is an emerging technique in X-ray astronomy and holds immense potential for enhancing our understanding of the extreme...


Tag neutron stars

XpoSat: India's venture into the new frontier of X-ray astronomy

The Indian Space Research Organisation (ISRO) commenced the new year with the launch of the X-Ray Polarimeter Satellite (XPoSat). X-ray polarization measurement is an emerging technique in X-ray astronomy and holds immense potential for enhancing our understanding of the extreme...


Tag black holes

XpoSat: India's venture into the new frontier of X-ray astronomy

The Indian Space Research Organisation (ISRO) commenced the new year with the launch of the X-Ray Polarimeter Satellite (XPoSat). X-ray polarization measurement is an emerging technique in X-ray astronomy and holds immense potential for enhancing our understanding of the extreme...


Tag Blazar

Magnetic reconnection as Cosmic lighthouse

The process of production of high energy gamma-ray photons within the jets of blazars remains a mystery, with limited understanding of processes driving the particle accelerations over parsec scales and beyond. The complexity deepens with the detection of photons reaching...


Tag High energy astrophysics

Magnetic reconnection as Cosmic lighthouse

The process of production of high energy gamma-ray photons within the jets of blazars remains a mystery, with limited understanding of processes driving the particle accelerations over parsec scales and beyond. The complexity deepens with the detection of photons reaching...


Tag Gamma-ray

Magnetic reconnection as Cosmic lighthouse

The process of production of high energy gamma-ray photons within the jets of blazars remains a mystery, with limited understanding of processes driving the particle accelerations over parsec scales and beyond. The complexity deepens with the detection of photons reaching...


Tag X-ray

Magnetic reconnection as Cosmic lighthouse

The process of production of high energy gamma-ray photons within the jets of blazars remains a mystery, with limited understanding of processes driving the particle accelerations over parsec scales and beyond. The complexity deepens with the detection of photons reaching...


Tag Magnetic Reconnection

Magnetic reconnection as Cosmic lighthouse

The process of production of high energy gamma-ray photons within the jets of blazars remains a mystery, with limited understanding of processes driving the particle accelerations over parsec scales and beyond. The complexity deepens with the detection of photons reaching...


Tag Radio survey

Using Light to Trace Dark Matter

Studying the spatial distribution of extragalactic source populations is vital in understanding the matter distribution in the Universe, the cosmological evolution of matter density fields and the relationship between dark matter and luminous matter. This article investigates the clustering properties...