Aswin P. Vijayan
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View article: <tt>Cloudy-Maraston</tt> : integrating nebular continuum and line emission with the Maraston stellar population synthesis models
Cloudy-Maraston : integrating nebular continuum and line emission with the Maraston stellar population synthesis models Open
The James Webb Space Telescope has ushered in an era of abundant high-redshift observations of young stellar populations characterized by strong emission lines, motivating us to integrate nebular emission into the new Maraston stellar popu…
View article: Rapid, out of equilibrium metal enrichment indicated by a flat mass-metallicity relation at z~6 from NIRCam grism spectroscopy
Rapid, out of equilibrium metal enrichment indicated by a flat mass-metallicity relation at z~6 from NIRCam grism spectroscopy Open
We aim to characterise the mass-metallicity relation (MZR) and the 3D correlation between stellar mass, metallicity and star-formation rate (SFR) known as the fundamental metallicity relation (FMR) for galaxies at $5
View article: Synthesizer: a Software Package for Synthetic Astronomical Observables
Synthesizer: a Software Package for Synthetic Astronomical Observables Open
We present Synthesizer, a fast, flexible, modular and extensible platform for modelling synthetic astrophysical observables. Synthesizer can be used for a number of applications, but is predominantly designed for generating mock observable…
View article: First light and reionization epoch simulations (FLARES) – XIX. Supermassive black hole mergers in the early Universe and their environmental dependence
First light and reionization epoch simulations (FLARES) – XIX. Supermassive black hole mergers in the early Universe and their environmental dependence Open
The upcoming space-based gravitational wave (GW) observatory, Laser Interferometer Space Antenna (LISA), is expected to detect GW signals from supermassive black hole (SMBH) mergers occurring at high redshifts. However, understanding the o…
View article: The Nature of High-Redshift Massive Quiescent Galaxies -- Searching for RUBIES-UDS-QG-z7 in FLARES
The Nature of High-Redshift Massive Quiescent Galaxies -- Searching for RUBIES-UDS-QG-z7 in FLARES Open
RUBIES-UDS-QG-z7 (RQG) is the earliest massive quiescent galaxy identified to date, inferred to have formed its abundant stellar mass in a single burst that ceases rapidly before $z \sim 8$. An object of such extreme nature challenges our …
View article: REBELS-IFU: on the origin of the elevated [OIII]/[CII] ratios in the early Universe
REBELS-IFU: on the origin of the elevated [OIII]/[CII] ratios in the early Universe Open
We present new ALMA [OIII]$_{88}$ observations of eight previously [CII]$_{158}$-detected galaxies at $6.8 \lesssim z \lesssim 7.7$. Six of our targets -- the primary sample -- are massive, UV-luminous galaxies drawn from the REBELS survey…
View article: Behind the spotlight: a systematic assessment of outshining using NIRCam medium bands in the JADES Origins Field
Behind the spotlight: a systematic assessment of outshining using NIRCam medium bands in the JADES Origins Field Open
The spatial resolution and sensitivity of James Webb Space Telescope’s NIRCam instrument have revolutionized our ability to probe the internal structure of early galaxies. By leveraging deep medium-band imaging in the Jades Origins Field, …
View article: A PAH deficit in the starburst core of a distant spiral galaxy
A PAH deficit in the starburst core of a distant spiral galaxy Open
We present high-resolution and spatially matched observations with JWST and ALMA of a starburst galaxy (PACS-830) at $z=1.46$. The NIRCam observations mainly trace the stellar light while the CO (J=5–4) observations map the dense molecular…
View article: First Light and Reionization Epoch Simulations (FLARES) -- XVIII: the ionising emissivities and hydrogen recombination line properties of early AGN
First Light and Reionization Epoch Simulations (FLARES) -- XVIII: the ionising emissivities and hydrogen recombination line properties of early AGN Open
One of the most remarkable results from the \emph{James Webb Space Telescope} has been the discovery of a large population of compact sources exhibiting strong broad H$α$ emission, typically interpreted to be low-luminosity broad-line (Typ…
View article: COSMOS-Web: A history of galaxy migrations over the stellar mass–star formation rate plane
COSMOS-Web: A history of galaxy migrations over the stellar mass–star formation rate plane Open
Context. The stellar mass-star formation rate ( M ⋆ − SFR) plane is an essential diagnostic to separate galaxy populations. However, we still lack a clear picture of how galaxies move within this plane along cosmic time. Aims. This study a…
View article: First Light and Reionization Epoch Simulations (FLARES) – XV: The physical properties of super-massive black holes and their impact on galaxies in the early universe
First Light and Reionization Epoch Simulations (FLARES) – XV: The physical properties of super-massive black holes and their impact on galaxies in the early universe Open
Understanding the co-evolution of super-massive black holes (SMBHs) and their host galaxies remains a key challenge of extragalactic astrophysics, particularly the earliest stages at high-redshift. However, studying SMBHs at high-redshift …
View article: First Light and Reionization Epoch Simulations (FLARES) – XVII. Learning the galaxy–halo connection at high redshifts
First Light and Reionization Epoch Simulations (FLARES) – XVII. Learning the galaxy–halo connection at high redshifts Open
Understanding the galaxy–halo relationship is not only key for elucidating the interplay between baryonic and dark matter, it is essential for creating large mock galaxy catalogues from N-body simulations. High-resolution hydrodynamical si…
View article: Like a candle in the wind: the embers of once aflame, now smouldering galaxies at 5 &lt; <i>z</i> &lt; 8
Like a candle in the wind: the embers of once aflame, now smouldering galaxies at 5 < <i>z</i> < 8 Open
We develop a photometric search method for identifying smouldering galaxies at $5\lt z \lt 8$, which are defined to have weak emission lines and thus generally have low specific star formation rates and may even be in a state of (temporary…
View article: COSMOS-Web: Stellar mass assembly in relation to dark matter halos across 0.2 < <i>z</i> < 12 of cosmic history
COSMOS-Web: Stellar mass assembly in relation to dark matter halos across 0.2 < <i>z</i> < 12 of cosmic history Open
We study the stellar mass assembly of galaxies via the stellar mass function (SMF) and the coevolution with dark matter halos via abundance matching in the largest redshift range to date, 0.2 < z < 12. We used the 0.53 deg 2 imaged by JWST…
View article: SCUBADive. I. JWST+ALMA Analysis of 289 Submillimeter Galaxies in COSMOS-web
SCUBADive. I. JWST+ALMA Analysis of 289 Submillimeter Galaxies in COSMOS-web Open
JWST has enabled detecting and spatially resolving the heavily dust-attenuated stellar populations of submillimeter galaxies, revealing detail that was previously inaccessible. In this work, we construct a sample of 289 submillimeter galax…
View article: Cloudy-Maraston: Integrating nebular continuum and line emission with the Maraston stellar population synthesis models
Cloudy-Maraston: Integrating nebular continuum and line emission with the Maraston stellar population synthesis models Open
The James Webb Space Telescope has ushered in an era of abundant high-redshift observations of young stellar populations characterized by strong emission lines, motivating us to integrate nebular emission into the new Maraston stellar popu…
View article: EPOCHS. IV. SED Modeling Assumptions and Their Impact on the Stellar Mass Function at 6.5 ≤ z ≤ 13.5 Using PEARLS and Public JWST Observations
EPOCHS. IV. SED Modeling Assumptions and Their Impact on the Stellar Mass Function at 6.5 ≤ z ≤ 13.5 Using PEARLS and Public JWST Observations Open
We utilize deep JWST Near Infrared Camera (NIRCam) observations for the first direct constraints on the Galaxy Stellar Mass Function (GSMF) at z > 10. Our EPOCHS v1 sample includes 1120 galaxy candidates at 6.5 < z < 13.5 taken from a cons…
View article: Discovery of dual "little red dots" indicates excess clustering on kilo-parsec scales
Discovery of dual "little red dots" indicates excess clustering on kilo-parsec scales Open
``Little Red Dots'' (LRDs) are an abundant high-redshift population newly discovered by the James Webb Space Telescope (JWST). They are characterized by a red color in the rest-frame optical band, compact morphology, and broad Balmer emiss…
View article: First Light and Reionisation Epoch Simulations (FLARES) XVII: Learning the galaxy-halo connection at high redshifts
First Light and Reionisation Epoch Simulations (FLARES) XVII: Learning the galaxy-halo connection at high redshifts Open
Understanding the galaxy-halo relationship is not only key for elucidating the interplay between baryonic and dark matter, it is essential for creating large mock galaxy catalogues from N-body simulations. High-resolution hydrodynamical si…
View article: COSMOS-Web: A history of galaxy migrations over the stellar mass-star formation rate plane
COSMOS-Web: A history of galaxy migrations over the stellar mass-star formation rate plane Open
The stellar mass-star formation rate ($\mathrm{M_*}$-$\mathrm{SFR}$) plane is a fundamental diagnostic for distinguishing galaxy populations. However, the evolutionary pathways of galaxies within this plane across cosmic time remain poorly…
View article: The structure of massive star-forming galaxies from JWST and ALMA: Dusty, high-redshift disc galaxies
The structure of massive star-forming galaxies from JWST and ALMA: Dusty, high-redshift disc galaxies Open
We present an analysis of the JWST NIRCam and MIRI morphological and structural properties of 80 massive (log 10 ( M * [M ⊙ ]) = 11.2 ± 0.1) dusty star-forming galaxies at z = 2.7 −0.7 +1.2 , identified as sub-millimetre galaxies (SMGs) by…
View article: A photo-<i>z</i> cautionary tale: Redshift confirmation of COSBO-7 at <i>z</i> = 2.625
A photo-<i>z</i> cautionary tale: Redshift confirmation of COSBO-7 at <i>z</i> = 2.625 Open
Photometric redshifts are widely used in studies of dusty star-forming galaxies (DSFGs), but catastrophic photo- z failure can undermine all redshift-dependent results. Here we report the spectroscopic redshift confirmation of COSBO-7, a s…
View article: Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web
Unveiling the Distant Universe: Characterizing z ≥ 9 Galaxies in the First Epoch of COSMOS-Web Open
We report the identification of 15 galaxy candidates at z ≥ 9 using the initial COSMOS-Web JWST observations over 77 arcmin 2 through four Near Infrared Camera filters (F115W, F150W, F277W, and F444W) with an overlap with the Mid-Infrared …
View article: First Light And Reionisation Epoch Simulations (FLARES) XVI: Size Evolution of Massive Dusty Galaxies at Cosmic Dawn from UV to IR
First Light And Reionisation Epoch Simulations (FLARES) XVI: Size Evolution of Massive Dusty Galaxies at Cosmic Dawn from UV to IR Open
We use the First Light And Reionisation Epoch Simulations (FLARES) to study the evolution of the rest-frame ultraviolet (UV) and far-infrared (FIR) sizes for a statistical sample of massive ($\gtrsim10^{9}$M$_{\odot}$) high redshift galaxi…
View article: Accurate simultaneous constraints on the dust mass, temperature, and emissivity index of a galaxy at redshift 7.31
Accurate simultaneous constraints on the dust mass, temperature, and emissivity index of a galaxy at redshift 7.31 Open
We present new multifrequency Atacama Large Millimeter/submillimeter Array (ALMA) continuum observations of the massive [$\log _{10}(M_\star /\mathrm{M}_\odot) = 10.3_{-0.2}^{+0.1}$], UV-luminous [$M_\mathrm{UV} = -21.7 \pm 0.2$] $z=7.31$ …
View article: SCUBADive I: JWST+ALMA Analysis of 289 sub-millimeter galaxies in COSMOS-Web
SCUBADive I: JWST+ALMA Analysis of 289 sub-millimeter galaxies in COSMOS-Web Open
JWST has enabled detecting and spatially resolving the heavily dust-attenuated stellar populations of sub-millimeter galaxies, revealing detail that was previously inaccessible. In this work we construct a sample of 289 sub-millimeter gala…
View article: The Radio Galaxy Environment Reference Survey (RAGERS): a submillimetre study of the environments of massive radio-quiet galaxies at <i>z</i> = 1–3
The Radio Galaxy Environment Reference Survey (RAGERS): a submillimetre study of the environments of massive radio-quiet galaxies at <i>z</i> = 1–3 Open
Measuring the environments of massive galaxies at high redshift is crucial to understanding galaxy evolution and the conditions that gave rise to the distribution of matter we see in the Universe today. While high-z radio galaxies (HzRGs) …
View article: Accurate Simultaneous Constraints on the Dust Mass, Temperature and Emissivity Index of a Galaxy at Redshift 7.31
Accurate Simultaneous Constraints on the Dust Mass, Temperature and Emissivity Index of a Galaxy at Redshift 7.31 Open
We present new multi-frequency ALMA continuum observations of the massive [$\log_{10}(M_\star/M_\odot) = 10.3_{-0.2}^{+0.1}$], UV-luminous [$M_\mathrm{UV} = -21.7 \pm 0.2$] $z=7.31$ galaxy REBELS-25 in Bands 3, 4, 5, and 9. Combining the n…
View article: The RAdio Galaxy Environment Reference Survey (RAGERS): Evidence of an anisotropic distribution of submillimeter galaxies in the 4C 23.56 protocluster at z=2.48
The RAdio Galaxy Environment Reference Survey (RAGERS): Evidence of an anisotropic distribution of submillimeter galaxies in the 4C 23.56 protocluster at z=2.48 Open
High-redshift radio(-loud) galaxies (H$z$RGs) are massive galaxies with powerful radio-loud active galactic nuclei (AGNs) and serve as beacons for protocluster identification. However, the interplay between H$z$RGs and the large-scale envi…
View article: The Structure of Massive Star-Forming Galaxies from JWST and ALMA: Dusty, High Redshift Disk Galaxies
The Structure of Massive Star-Forming Galaxies from JWST and ALMA: Dusty, High Redshift Disk Galaxies Open
We present an analysis of the JWST NIRCam and MIRI morphological properties of 80 massive ($\log_{10}(M_\ast[M_{\odot}])$=11.2$\pm$0.1) dusty star-forming galaxies at $z$$=$2.7$^{+1.2}_{-0.7}$, identified as sub-millimetre galaxies (SMGs) …