289 citations · 710 across the 25 of their papers we have counts for
26 papers
A Massive Galaxy at the Edge of Feedback-Free Efficiency
K. Aditya, Kartick C. Sarkar
The efficiency with which galaxies convert their available baryonic reservoir into stars sets a fundamental ceiling on stellar mass assembly in the early Universe and encodes the c…
Non-Equilibrium Ionisation in Photoionised Haloes: Implications for Shock Stability and Absorption-Line Signatures
Itai Bromberg, Kartick C. Sarkar, Orly Gnat +1
We investigate the impact of nonequilibrium ionisation (NEI) and the metagalactic radiation-field on the thermal evolution, virial shock stability, and absorption signatures of gas…
Fast modelling of ionization balance in the intergalactic medium: I- implications for the IGM metallicity
Bhaskar Arya, Kartick C. Sarkar, Shiv K. Sethi
Ionization balance in the intergalactic medium (IGM) is central to the interpretation of quasar absorption spectra, linking observed ionic columns to the underlying gas density, te…
Origin of the ~150 kpc radio filament in galaxy ESO 137-006
Toushif Alam, Kunal P. Mooley, Kartick C. Sarkar
Sensitive wide-field radio surveys have started uncovering many filamentary structures associated with the jets and lobes of radio galaxies, radio relics in galaxy clusters, and ta…
A 13-Billion-Year View of Galaxy Growth: Metallicity Gradient Evolution from the Local Universe to with JWST and Archival Surveys
Zihao Li, Zheng Cai, Xin Wang +25
The galaxy gas-phase metallicity gradients have been extensively studied over the past four decades, both in the local and high-redshift universe, as they trace the baryon cycle an…
Intergalactic-Absorption Confounding Circumgalactic Observations
Itai Bromberg, Kartick C. Sarkar, Orly Gnat +1
The origin of warm ions in the circum-galactic medium (CGM) surrounding massive galaxies remains a mystery. In this paper, we argue that a significant fraction of the observed warm…
X-ray signatures of galactic outflows into the circumgalactic medium
Ranita Jana, Kartick C. Sarkar, Jonathan Stern +1
We present a set of controlled hydrodynamical simulations to study the effects of strong galactic outflows on the density and temperature structures, and associated X-ray signature…
The Fermi/eROSITA Bubbles: A look into the nuclear outflow from the Milky Way
Kartick C. Sarkar
Galactic outflows are ubiquitous in galaxies containing active star formation or supermassive black hole activity. The presence of a large-scale outflow from the center of our own…
Dissipation of AGN jets in a clumpy interstellar medium
Riju Dutta, Prateek Sharma, Kartick C. Sarkar +1
Accreting supermassive black holes (SMBHs) frequently power jets that interact with the interstellar/circumgalactic medium (ISM/CGM), regulating star-formation in the galaxy. Highl…
Feedback-Free Starbursts at Cosmic Dawn: Observable Predictions for JWST
Zhaozhou Li, Avishai Dekel, Kartick C. Sarkar +4
We extend the analysis of a physical model within the standard cosmology that robustly predicts a high star-formation efficiency (SFE) in massive galaxies at cosmic dawn due to fee…
Are Odd Radio Circles virial shocks around massive galaxies? Implications for cosmic-ray diffusion in the circumgalactic medium
Shotaro Yamasaki, Kartick C. Sarkar, Zhaozhou Li
Recently, a new population of circular radio (GHz) objects have been discovered at high Galactic latitudes, called the Odd Radio Circles (ORCs). A fraction of the ORCs encirc…
Efficient Formation of Massive Galaxies at Cosmic Dawn by Feedback-Free Starbursts
Avishai Dekel, Kartick S. Sarkar, Yuval Birnboim +2
JWST observations indicate a surprising excess of luminous galaxies at and above, consistent with efficient conversion of the accreted gas into stars, unlike the suppres…
Misaligned jets from Sgr A and the origin of Fermi/eROSITA bubbles
Kartick C. Sarkar, Santanu Mondal, Prateek Sharma +1
One of the leading explanations for the origin of Fermi Bubbles is a past jet activity in the Galactic center supermassive black hole Sgr A. The claimed jets are often assumed…
Conditions for Clump Survival in High-z Disc Galaxies
Avishai Dekel, Offek Tziperman, Kartick Sarkar +4
We study the survival versus disruption of the giant clumps in high-redshift disc galaxies, short-lived (S) versus long-lived (L) clumps and two L sub-types, via analytic modeling…
Self-ionizing galactic winds
Kartick C. Sarkar, Amiel Sternberg, Orly Gnat
We present hydrodynamical simulations of galactic winds from star-forming galaxies including non-equilibrium ionization and frequency-dependent radiative transfer, processes that h…
Deprojection of X-ray data in galaxy clusters: confronting simulations with observations
Kartick C Sarkar, Arjun Dey, Prateek Sharma
Numerical simulations with varying realism indicate an emergent principle -- multiphase condensation and large cavity power occur when the ratio of the cooling time to the free-fal…
Fermi bubbles: the collimated outburst needed to explain forward-shock edges
Santanu Mondal, Uri Keshet, Kartick C. Sarkar +1
The bipolar, nonthermal, high-latitude lobes known as the Fermi bubbles (FBs) are thought to originate from a massive energy release near the Galactic centre (GC). We constrain the…
Non-equilibrium ionisation and radiative transport in an evolving supernova remnant
Kartick Chandra Sarkar, Orly Gnat, Amiel Sternberg
We present numerical simulations of the evolution of a supernova (SN) remnant expanding into a uniform background medium with density cm and temperature of $10^4…
A new ionisation network and radiation transport module in PLUTO
Kartick Chandra Sarkar, Amiel Sternberg, Orly Gnat
We introduce a new general-purpose time-dependent ionisation network (IN) and a radiation transport (RT) module in the magneto-hydrodynamic (MHD) code PLUTO. Our ionisation network…
The Global Star-Formation Law by Supernova Feedback
Avishai Dekel, Kartick C. Sarkar, Fangzhou Jiang +4
We address a simple model where the Kennicutt-Schmidt (KS) relation between the macroscopic densities of star-formation rate (SFR, ) and gas () in galactic discs em…
Possible connection between the asymmetry of North Polar Spur and Loop I with Fermi Bubbles
Kartick Chandra Sarkar
The origin of North Polar Spur (NPS) and Loop-I has been debated over almost half a century and is still unresolved. Most of the confusion is caused by the absence of any prominent…
Extra-planar X-ray emission from disc-wide outflows in spiral galaxies
Aditi Vijayan, Kartick C. Sarkar, Biman B. Nath +2
We study the effects of mass and energy injection due to OB associations spread across the rotating disc of a Milky Way-type galaxy, with the help of 3D hydrodynamic simulations. W…
Clues to the origin of Fermi Bubbles from OVIII/OVII line ratio
Kartick C. Sarkar, Biman B. Nath, Prateek Sharma
We constrain the origin of Fermi Bubbles using 2D hydrodynamical simulations of both star formation driven and black hole accretion driven wind models. We compare our results with…
Diffuse X-ray emission from star forming galaxies
Kartick C. Sarkar, Biman B. Nath, Prateek Sharma +1
We study the diffuse X-ray luminosity () of star forming galaxies using 2-D axisymmetric hydrodynamical simulations and analytical considerations of supernovae (SNe) driven ga…