Rohan P. Naidu
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View article: Little red dot variability over a century reveals black hole envelope via a giant Einstein cross
Little red dot variability over a century reveals black hole envelope via a giant Einstein cross Open
"Little red dots" (LRDs) represent a new population of astronomical objects uncovered by JWST whose nature remains debated. Although many LRDs are suspected as active galactic nuclei (AGN), they show little variability on days-years timesc…
View article: JWST's GLIMPSE: an overview of the deepest probe of early galaxy formation and cosmic reionization
JWST's GLIMPSE: an overview of the deepest probe of early galaxy formation and cosmic reionization Open
We present an overview of the JWST GLIMPSE program, highlighting its survey design, primary science goals, gravitational lensing models, and first results. GLIMPSE provides ultra-deep JWST/NIRCam imaging across seven broadband filters (F09…
View article: Escape Fractions from Unattenuated Ly <i>α</i> Emitters around Luminous <i>z</i> > 6 Quasars
Escape Fractions from Unattenuated Ly <i>α</i> Emitters around Luminous <i>z</i> > 6 Quasars Open
Ionized proximity zones around luminous quasars provide a unique laboratory to characterize the Ly α emission lines from z > 6 galaxies without significant attenuation from the intergalactic medium (IGM). However, Ly α line measurements fo…
View article: Evolutionary Tracks and Spectral Properties of Quasi-stars and Their Correlation with Little Red Dots
Evolutionary Tracks and Spectral Properties of Quasi-stars and Their Correlation with Little Red Dots Open
JWST has revealed a population of red, compact, high-redshift (${z\sim3-10}$) objects referred to as ``Little Red Dots'' (LRDs). These objects exhibit unusual spectral features reminiscent of stellar spectra with blackbody-like SEDs, large…
View article: The Blue Jay Survey: Deep JWST Spectroscopy for a Representative Sample of Galaxies at Cosmic Noon
The Blue Jay Survey: Deep JWST Spectroscopy for a Representative Sample of Galaxies at Cosmic Noon Open
We present the Blue Jay survey, a Cycle-1 JWST program aimed at studying the stellar and gas content of galaxies at Cosmic Noon. The survey consists of deep spectroscopy for 153 targets observed over two pointings in the COSMOS field using…
View article: EIGER VIII: First stars signatures in the connection between OI absorption and Galaxies in the Epoch of Reionization
EIGER VIII: First stars signatures in the connection between OI absorption and Galaxies in the Epoch of Reionization Open
We investigate the association between galaxies and neutral OI absorption systems at z~6, which trace metal-enriched gas during the epoch of reionization. We identify 40 galaxies across six quasar fields, residing in 15 overdensities withi…
View article: The first GLIMPSE of the faint galaxy population at Cosmic Dawn with JWST: The evolution of the ultraviolet luminosity function across z~9-15
The first GLIMPSE of the faint galaxy population at Cosmic Dawn with JWST: The evolution of the ultraviolet luminosity function across z~9-15 Open
Using ultra-deep JWST NIRCam imaging from the GLIMPSE Survey, enhanced by gravitational lensing of the AbellS1063 cluster, we investigate the faintest galaxies ever observed in the redshift range z~9 to z~15. We identify 105 galaxy candida…
View article: The Light Echo of a High-redshift Quasar Mapped with Ly<i>α</i> Tomography
The Light Echo of a High-redshift Quasar Mapped with Ly<i>α</i> Tomography Open
Ultraviolet (UV) radiation from accreting black holes ionizes the intergalactic gas around early quasars, carving out highly ionized bubbles in their surroundings. Any changes in a quasar’s luminosity are therefore predicted to produce out…
View article: A GLIMPSE of Intermediate Mass Black holes in the epoch of reionization: Witnessing the Descendants of Direct Collapse?
A GLIMPSE of Intermediate Mass Black holes in the epoch of reionization: Witnessing the Descendants of Direct Collapse? Open
JWST has revealed an abundance of supermassive black holes (BHs) in the early Universe, and yet the lowest mass seed black holes that gave rise to these populations remain elusive. Here we present a systematic search for broad-line Active …
View article: A Confirmed Deficit of Hot and Cold Dust Emission in the Most Luminous Little Red Dots
A Confirmed Deficit of Hot and Cold Dust Emission in the Most Luminous Little Red Dots Open
Luminous broad H α emission and red rest-optical spectral energy distributions (SEDs) are the hallmark of compact little red dots (LRDs), implying highly attenuated dusty starbursts and/or obscured active galactic nuclei (AGN). However, th…
View article: The Light Echo of a High-Redshift Quasar mapped with Lyman-$α$ Tomography
The Light Echo of a High-Redshift Quasar mapped with Lyman-$α$ Tomography Open
Ultra-violet (UV) radiation from accreting black holes ionizes the intergalactic gas around early quasars, carving out highly ionized bubbles in their surroundings. Any changes in a quasar's luminosity are therefore predicted to produce ou…
View article: What you see is what you get: empirically measured bolometric luminosities of Little Red Dots
What you see is what you get: empirically measured bolometric luminosities of Little Red Dots Open
New populations of red active galactic nuclei (known as ``Little Red Dots'') discovered by JWST exhibit remarkable spectral energy distributions. Leveraging X-ray through far-infrared observations of two of the most luminous known Little R…
View article: The Diversity and Evolution of Dust Attenuation Curves from Redshift z ~ 1 to 9
The Diversity and Evolution of Dust Attenuation Curves from Redshift z ~ 1 to 9 Open
The UV-optical dust attenuation curve is key to interpreting the intrinsic properties of galaxies and provides insights into the nature of dust grains and their geometry relative to stars. In this work, we constrain the UV-optical slope of…
View article: A remarkable ruby: Absorption in dense gas, rather than evolved stars, drives the extreme Balmer break of a little red dot at <i>z</i> = 3.5
A remarkable ruby: Absorption in dense gas, rather than evolved stars, drives the extreme Balmer break of a little red dot at <i>z</i> = 3.5 Open
The origin of the rest-optical emission of compact, red, high-redshift sources known as little red dots (LRDs) poses a major puzzle. If interpreted as starlight, it would imply that LRDs constitute the densest stellar systems in the Univer…
View article: JWST Spectroscopic Insights Into the Diversity of Galaxies in the First 500 Myr: Short-Lived Snapshots Along a Common Evolutionary Pathway
JWST Spectroscopic Insights Into the Diversity of Galaxies in the First 500 Myr: Short-Lived Snapshots Along a Common Evolutionary Pathway Open
We investigate the nature and spectroscopic diversity of early galaxies from a sample of 40 sources at z>10 with JWST/NIRSpec prism observations, the largest of its kind thus far. We compare the properties of strong UV line emitters, as tr…
View article: RUBIES: A spectroscopic census of little red dots
RUBIES: A spectroscopic census of little red dots Open
The physical nature of little red dots (LRDs), a population of compact red galaxies revealed by JWST, remains unclear. Photometric samples were constructed from varying selection criteria with limited spectroscopic follow-up available to t…
View article: GA-NIFS and EIGER: A merging quasar host at <i>z</i> = 7 with an overmassive black hole
GA-NIFS and EIGER: A merging quasar host at <i>z</i> = 7 with an overmassive black hole Open
The James Webb Space Telescope is revolutionising our ability to understand the host galaxies and local environments of high- z quasars. Here we obtain a comprehensive understanding of the host galaxy of the z = 7.08 quasar J1120+0641 by c…
View article: GLIMPSE: An Ultrafaint ≃10<sup>5</sup> <i>M</i> <sub>⊙</sub> Pop III Galaxy Candidate and First Constraints on the Pop III UV Luminosity Function at <i>z</i> ≃ 6–7
GLIMPSE: An Ultrafaint ≃10<sup>5</sup> <i>M</i> <sub>⊙</sub> Pop III Galaxy Candidate and First Constraints on the Pop III UV Luminosity Function at <i>z</i> ≃ 6–7 Open
Detecting the first generation of stars, Population III (Pop III), has been a long-standing goal in astrophysics, yet they remain elusive even in the JWST era. Here we present a novel NIRCam-based selection method for Pop III galaxies, and…
View article: Environmental Evidence for Overly Massive Black Holes in Low-mass Galaxies and a Black Hole–Halo Mass Relation at <i>z</i> ∼ 5
Environmental Evidence for Overly Massive Black Holes in Low-mass Galaxies and a Black Hole–Halo Mass Relation at <i>z</i> ∼ 5 Open
JWST observations have unveiled faint active galactic nuclei (AGNs) at high redshift that provide insights into the formation of supermassive black holes (SMBHs). However, disentangling their stellar from AGN light is challenging. Here, we…
View article: All-sky Kinematics of the Distant Halo: The Reflex Response to the LMC
All-sky Kinematics of the Distant Halo: The Reflex Response to the LMC Open
The infall of the Large Magellanic Cloud (LMC) is predicted to displace the inner Milky Way (MW), imprinting an apparent “reflex motion” on the observed velocities of distant halo stars. We construct the largest all-sky spectroscopic data …
View article: All-sky Kinematics of the Distant Halo: The Reflex Response to the LMC
All-sky Kinematics of the Distant Halo: The Reflex Response to the LMC Open
The infall of the Large Magellanic Cloud (LMC) is predicted to displace the inner Milky Way (MW), imprinting an apparent “reflex motion” on the observed velocities of distant halo stars. We construct the largest all-sky spectroscopic data …
View article: No [C II] or dust detection in two Little Red Dots at <i>z</i><sub>spec</sub>> 7
No [C II] or dust detection in two Little Red Dots at <i>z</i><sub>spec</sub>> 7 Open
Little Red Dots (LRDs) are compact, point-like sources characterized by their red color and broad Balmer lines; it is a matter of debate whether they are dominated by active galactic nuclei (AGNs) or dusty star-forming galaxies (DSFGs). He…
View article: Escape fractions from unattenuated Ly$α$ emitters around luminous $z>6$ quasars
Escape fractions from unattenuated Ly$α$ emitters around luminous $z>6$ quasars Open
Ionized proximity zones around luminous quasars provide a unique laboratory to characterize the Ly$α$ emission lines from $z>6$ galaxies without significant attenuation from the intergalactic medium (IGM). However, Ly$α$ line measurements …
View article: EIGER VII. The evolving relationship between galaxies and the intergalactic medium in the final stages of reionization
EIGER VII. The evolving relationship between galaxies and the intergalactic medium in the final stages of reionization Open
We present a comprehensive analysis of the relationship between galaxies and the intergalactic medium (IGM) during the late stages of cosmic reionization, based on the complete JWST EIGER dataset. Using deep NIRCam $3.5\,\mathrm{μm}$ slitl…
View article: Constraints on the early Universe star formation efficiency from galaxy clustering and halo modeling of H <i>α</i> and [O III] emitters
Constraints on the early Universe star formation efficiency from galaxy clustering and halo modeling of H <i>α</i> and [O III] emitters Open
We have developed a theoretical framework that provides observational constraints on the early Universe galaxy-halo connection by combining measurements of the ultraviolet luminosity function (UVLF) and galaxy clustering via the two-point …
View article: A Cosmic Miracle: A Remarkably Luminous Galaxy at $z_{\rm{spec}}=14.44$ Confirmed with JWST
A Cosmic Miracle: A Remarkably Luminous Galaxy at $z_{\rm{spec}}=14.44$ Confirmed with JWST Open
JWST has revealed a stunning population of bright galaxies at surprisingly early epochs, $z>10$, where few such sources were expected. Here we present the most distant example of this class yet -- MoM-z14, a luminous ($M_{\rm{UV}}=-20.2$) …
View article: Investigating photometric and spectroscopic variability in the multiply imaged little red dot A2744-QSO1
Investigating photometric and spectroscopic variability in the multiply imaged little red dot A2744-QSO1 Open
JWST observations have uncovered a new population of red, compact objects at high redshifts dubbed “little red dots” (LRDs), which typically show broad emission lines and are thought to be dusty active galactic nuclei (AGNs). Some of their…
View article: A weak Ly$α$ halo for an extremely bright Little Red Dot: Indications of enshrouded SMBH growth
A weak Ly$α$ halo for an extremely bright Little Red Dot: Indications of enshrouded SMBH growth Open
The abundant population of "Little Red Dots" (LRDs)-compact objects with red UV to optical colors and broad Balmer lines at high redshift-is unveiling new insights into the properties of early active galactic nuclei (AGN). Perhaps the most…
View article: RUBIES: JWST/NIRSpec Confirmation of an Infrared-luminous, Broad-line Little Red Dot with an Ionized Outflow
RUBIES: JWST/NIRSpec Confirmation of an Infrared-luminous, Broad-line Little Red Dot with an Ionized Outflow Open
The JWST discovery of “little red dots” (LRDs) is reshaping our picture of the early Universe, yet the physical mechanisms driving their compact size and UV-optical colors remain elusive. Here, we report an unusually bright LRD ( z spec = …
View article: RUBIES: A complete census of the bright and red distant Universe with JWST/NIRSpec
RUBIES: A complete census of the bright and red distant Universe with JWST/NIRSpec Open
We present the Red Unknowns: Bright Infrared Extragalactic Survey (RUBIES) providing JWST/NIRSpec spectroscopy of red sources selected across ∼150 arcmin 2 from public JWST/NIRCam imaging in the UDS and EGS fields. The novel observing stra…