7 citations · 7 across the 27 of their papers we have counts for
29 papers
Massive double-exponential galaxies with extended LSB emission: An IllustrisTNG exploration II -are they unique?
Suchira Sarkar, Kanak Saha, Anshuman Borgohain
The massive disk galaxies (stellar mass >= 10^11 M_solar ) in the local universe (z < 0.1) encode challenging aspects of galaxy formation physics. We have studied one class of such…
PAH emission from star-forming and quiescent galaxies at probed by JWST/MIRI
Chayan Mondal, Chian-Chou Chen, Kanak Saha +4
We investigate emission from polycyclic aromatic hydrocarbon (PAH) dust molecules in 224 MIRI-selected star-forming and quiescent galaxies at in the GOODS-South field u…
Asymptotic limits in class- theories and non-Abelian Hodge theory
Thomas W. Grimm, Amineh Mohseni
We develop a non-Abelian Hodge-theoretic refinement of asymptotic limits in type- class- theories, enriching the geometric description of the degenerating UV curve w…
The kinematics of tadpole galaxies at intermediate redshift
Manish Kataria, Kanak Saha, Bruce Elmegreen
Galaxy morphology and kinematics encode complementary information about the assembly history of galaxies, but the extent to which they evolve in tandem remains unclear. Tadpole gal…
Rubin J122659.4+090236: An Extremely Low Surface Brightness Galaxy Candidate Discovered in the Rubin LSST Early Data Preview 2
Dipanjan Mitra, Kanak Saha, Sugata Kaviraj +28
We report the serendipitous discovery of an exceptionally low surface brightness galaxy (LSBG) candidate, Rubin J122659.4+090236, in Rubin Observatory imaging of the interacting NG…
Clump Migration in Disk Galaxies: Revisiting Chandrasekhar's Dynamical Friction
Pushpak Pandey, Kanak Saha
Massive stellar clumps are thought to migrate toward galactic centers through dynamical friction, contributing to bulge growth and the structural evolution of disk galaxies. While…
Detection and Properties of Lyman Break Galaxies at in GOODS-North
Bibhuprasad Mishra, Kanak Saha, Divya Pandey +1
Lyman Break Galaxies (LBGs) are actively star-forming galaxies identified through their characteristic rest-frame ultraviolet spectral break, making them powerful probes of galaxy…
Structural and dynamical properties of Tidal dwarf galaxies in the tails and bridge of the Guitar galaxy Arp 105
Jyoti Prakash, Kanak Saha
We present a multi-wavelength (far-ultraviolet to infrared) analysis of two tidal dwarf galaxy (TDG) candidates and a tidal bridge in the interacting system Arp 105 at …
Deep far-UV observations of the ELAIS N1 field using AstroSat: Source catalogue, spectral energy distribution modelling and star formation
Pranjal Chaturvedi, Akriti Sinha, Abhirup Datta +1
We present a far-ultraviolet (FUV) photometric study of the ELAIS N1 deep field using the Ultra-Violet Imaging Telescope (UVIT) onboard AstroSat, observed in the F154W filter ($λ_{…
Long-Term Dynamical Evolution and Ejection of Near-Earth Asteroids
Chetan Abhijnanam Bora, Badam Singh Kushvah, Kanak Saha
Long-term integrations of asteroid orbits with high-accuracy numerical integrators are essential for understanding dynamical evolution and ejection from the Solar System, but are c…
The Great Escape of ionizing photons during Cosmic Morning
Kanak Saha, Roland Bacon, Anne Verhamme +8
The end of the Cosmic Dark Age marked the onset of reionization, driven by extreme-UV photons from the first galaxies. Direct detection of such photons has remained challenging due…
The Kormendy Relation in the First Billion Years: Evidence from
Anshuman Borgohain, Kanak Saha
Galaxy scaling relations encode key information about the structural, dynamical, and mass assembly histories of galaxies, and provide constraints on galaxy formation models as well…
Escaping ionizing photons from massive spiral galaxies at
Soumil Maulick, Kanak Saha
We report the detection of Lyman continuum (LyC) photons from three massive () spiral galaxies at a redshift of nearly 1 in the AstroSat UV…
AstroSat UV Deep Field IV. An Extended UV disk around a massive spiral galaxy at z=0.67
Pushpak Pandey, Kanak Saha, Sanchayeeta Borthakur
Extended ultraviolet (XUV) emission in nearby disk galaxies supports the inside-out growth scenario through low-efficiency star formation in their outer regions. However, such dete…
Chemically primitive dwarf accretion reignites the inner disk assembly of Malin 1
Manish Kataria, Kanak Saha
We present a detailed kinematic and stellar population analysis of the inner disk of Malin 1, a giant low surface brightness (GLSB) galaxy with a prominent SB0-type central morphol…
Rapid bulge assembly in young galaxy disks at Cosmic Dawn
Anshuman Borgohain, Kanak Saha
Recent observations with the James Webb Space Telescope (JWST) have begun to reveal a surprising morphological diversity in galaxies within the first billion years after the Big Ba…
The AstroSat UV Deep Field South-V: Constraints on the average escape of ionizing photons in the cosmic dusk
Soumil Maulick, Kanak Saha
We investigate the escape of ionizing (Lyman-continuum; LyC) photons from 49 star-forming galaxies at redshifts , using far-ultraviolet (FUV) imaging from the Ultra-Vio…
GNHeII J1236+6215: A He II 1640 emitting and potentially LyC leaking galaxy at = 2.9803 unveiled through JWST & Keck observations
Chayan Mondal, Kanak Saha, Anshuman Borgohain +6
He II 1640 emission in galaxies indicates the presence of sources that produce extreme ionizing photons. Here, we report the discovery of a He II 1640 emitting galaxy, GNHeII…
Clump-fed black hole growth in the first billion years of the universe
Manish Kataria, Kanak Saha, Bruce Elmegreen
Understanding how supermassive black holes (SMBHs) form in the early universe is one of the most challenging problems in astrophysics. Their high abundance in the first billion yea…
The AstroSat UV Deep Field South. III. Evolution of the UV Luminosity Function and Luminosity Density from z~0.8-0.4
Souradeep Bhattacharya, Kanak Saha
We characterise the rest-frame 1500 Å UV luminosity Function (UVLF) from deep AstroSat/UVIT F154W and N242W imaging in the Great Observatories Origins Survey South (GOODS-S) deep f…
A geometric approach to estimate background in astronomical images
Pushpak Pandey, Kanak Saha
Estimating the true background in an astronomical image is fundamental to detecting faint sources. In a typical low-photon count astronomical image, such as in the far and near-ult…
The AstroSat UV Deep Field South II: A diverse set of Lyman-continuum leakers at
Soumil Maulick, Kanak Saha, Michael J. Rutkowski
We report the detection of 5 newly identifed Lyman-continuum (LyC) leaker candidates at redshifts 0.99-1.42 in the AstroSat UV Deep Field South F154W image. We derive physical prop…
AstroSat UV Deep Field South -- I. Far and Near-ultraviolet Source Catalog of the GOODS South region
Kanak Saha, Soumil Maulick, Pushpak Pandey +11
We present the AstroSat UV Deep Field South (AUDFs), an imaging survey using the wide-field Ultraviolet Imaging Telescope on board AstroSat. AUDFs covers arcmin of…
The leakage of Lyman-continuum photons from a major merger at
Soumil Maulick, Kanak Saha, Manish Kataria +1
We report the detection of Lyman-continuum (LyC) photons from a massive interacting system at in the Hubble Ultra Deep Field. The LyC detection is made in the far-ultravi…