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The Light Echo of a High-Redshift Quasar mapped with Lyman- Tomography
Anna-Christina Eilers, Minghao Yue, Jorryt Matthee +11
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…
Quasar lifetime measurements from extended Ly nebulae at
Dominika Ďurovčíková, Anna-Christina Eilers, Romain A. Meyer +7
The existence of billion-solar-mass black holes hosted in luminous quasars within the first gigayear of cosmic history poses a challenge to our understanding of supermassive black…
A Spatially Resolved [CII] Survey of 31 Massive Galaxies Hosting Luminous Quasars
Feige Wang, Jinyi Yang, Xiaohui Fan +15
The [CII] 158 m emission line and the underlying far-infrared (FIR) dust continuum are important tracers for studying star formation and kinematic properties of early galaxies.…
A Massive Protocluster Anchored by a Luminous Quasar at
Feige Wang, Jinyi Yang, Joseph F. Hennawi +13
Protoclusters, the progenitors of galaxy clusters, trace large scale structures in the early Universe and are important to our understanding of structure formation and galaxy evolu…
Recognizing Blazars Using Radio Morphology from the VLA Sky Survey
Zhang-Liang Xie, Eduardo Banados, Silvia Belladitta +4
Blazars are radio-loud Active Galactic Nuclei (AGN) whose jets have a very small angle to our line of sight. Observationally, the radio emission are mostly compact or a compact-cor…
Possible Contamination of the Intergalactic Medium Damping Wing in ULAS J1342+0928 by Proximate Damped Ly Absorption
Frederick B. Davies, Eduardo Bañados, Joseph F. Hennawi +1
The red damping wing from neutral hydrogen in the intergalactic medium is a smoking-gun signal of ongoing reionization. One potential contaminant of the intergalactic damping wing…
Searching for the Imprints of AGN Feedback on the Lyman Alpha Forest Around Luminous Red Galaxies
Vikram Khaire, Teng Hu, Joseph F. Hennawi +3
We explore the potential of using the low-redshift Lyman- (Ly) forest surrounding luminous red galaxies (LRGs) as a tool to constrain active galactic nuclei (AGN) feedback mo…
The relationship between IGM Lyman-alpha opacity and galaxy density near the end of reionization
Holly M. Christenson, George D. Becker, Anson D'Aloisio +6
Observed scatter in the Lyman-alpha opacity of quasar sightlines at has motivated measurements of the correlation between Ly opacity and galaxy density, as models that pre…
XQR-30: the ultimate XSHOOTER quasar sample at the reionization epoch
Valentina D'Odorico, E. Banados, G. D. Becker +46
The final phase of the reionization process can be probed by rest-frame UV absorption spectra of quasars at z>6, shedding light on the properties of the diffuse intergalactic mediu…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): JWST Reveals a Filamentary Structure around a z=6.61 Quasar
Feige Wang, Jinyi Yang, Joseph F. Hennawi +56
We present the first results from the JWST ASPIRE program (A SPectroscopic survey of biased halos In the Reionization Era). This program represents an imaging and spectroscopic sur…
A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): A First Look at the Rest-frame Optical Spectra of Quasars Using JWST
Jinyi Yang, Feige Wang, Xiaohui Fan +53
Studies of rest-frame optical emission in quasars at have historically been limited by the wavelengths accessible by ground-based telescopes. The James Webb Space Telescope (…
Detecting and Characterizing Young Quasars. III. The Impact of Gravitational Lensing Magnification
Minghao Yue, Anna-Christina Eilers, Robert A. Simcoe +8
We test the impact of gravitational lensing on the lifetime estimates of seven high-redshift quasars at redshift . The targeted quasars are identified by their small obs…
On the recent discovery claim of a new quasar
Sarah E. I. Bosman, Frederick B. Davies, Eduardo Bañados
Koptelova et al. 2022 (K22) recently claimed a new quasar discovery at . After careful consideration of the publicly-available data underlying K22's claim, we find that the…
Examining the Decline in the C IV Content of the Universe over 4.3 < z < 6.3 using the E-XQR-30 Sample
Rebecca L. Davies, Emma Ryan-Weber, Valentina D'Odorico +12
Intervening CIV absorbers are key tracers of metal-enriched gas in galaxy halos over cosmic time. Previous studies suggest that the CIV cosmic mass density () decrease…
When Spectral Modeling Meets Convolutional Networks: A Method for Discovering Reionization-era Lensed Quasars in Multi-band Imaging Data
Irham Taufik Andika, Knud Jahnke, Arjen van der Wel +8
Over the last two decades, around 300 quasars have been discovered at , yet only one has identified as being strongly gravitationally lensed. We explore a new approach -…
A Generative Model for Quasar Spectra
Anna-Christina Eilers, David W. Hogg, Bernhard Schölkopf +3
We build a multi-output generative model for quasar spectra and the properties of their black hole engines, based on a Gaussian process latent-variable model. This model treats eve…
The X-shooter/ALMA Sample of Quasars in the Epoch of Reionization. II. Black Hole Masses, Eddington Ratios, and the Formation of the First Quasars
Emanuele Paolo Farina, Jan-Torge Schindler, Fabian Walter +20
We present measurements of black hole masses and Eddington ratios for a sample of 38 bright (M < -24.4 mag) quasars at 5.8 < z < 7.5, derived from VLT/X-shooter near-IR sp…
Staring at the Shadows of Archaic Galaxies: Damped Ly and Metal Absorbers toward a Young Weak-line Quasar
Irham Taufik Andika, Knud Jahnke, Eduardo Bañados +6
We characterize the Ly halo and absorption systems toward PSO J083+11, a unique weak-line quasar, using Gemini/GNIRS, Magellan/FIRE, and VLT/MUSE data. Strong absorpt…
Probing Early Super-massive Black Hole Growth and Quasar Evolution with Near-infrared Spectroscopy of 37 Reionization-era Quasars at 6.3 < z <= 7.64
Jinyi Yang, Feige Wang, Xiaohui Fan +18
We report the results of near-infrared spectroscopic observations of 37 quasars in the redshift range , including 32 quasars at , forming the largest quasar n…
Estimating the effective lifetime of the quasar population from the composite proximity zone profile
Karna A. Morey, Anna-Christina Eilers, Frederick B. Davies +2
The lifetime of quasars can be estimated by means of their proximity zone sizes, which are regions of enhanced flux bluewards of the Lyman- emission line observed in the rest-fr…
Detecting and Characterizing Young Quasars II: Four Quasars at with Lifetimes years
Anna-Christina Eilers, Joseph F. Hennawi, Frederick B. Davies +1
The extents of proximity zones of high-redshift quasars enable constraints on the timescales of quasar activity, which are fundamental for understanding the growth of the supermass…
The first measurement of the quasar lifetime distribution
Ilya S. Khrykin, Joseph F. Hennawi, Gabor Worseck +1
Understanding the growth of the supermassive black holes powering luminous quasars, their co-evolution with host galaxies, and impact on the surrounding intergalactic medium depend…
A Luminous Quasar at Redshift 7.642
Feige Wang, Jinyi Yang, Xiaohui Fan +20
Distant quasars are unique tracers to study the formation of the earliest supermassive black holes (SMBHs) and the history of cosmic reionization. Despite extensive efforts, only t…
Revealing the Accretion Physics of Supermassive Black Holes at Redshift z~7 with Chandra and Infrared Observations
Feige Wang, Xiaohui Fan, Jinyi Yang +14
X-ray emission from quasars has been detected up to redshift , although only limited to a few objects at . In this work, we present new Chandra observations of five $…