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IGM damping wing constraints on reionisation from covariance reconstruction of two QSOs
Bradley Greig, Andrei Mesinger, Frederick B. Davies +3
Bright, high redshift () QSOs are powerful probes of the ionisation state of the intervening intergalactic medium (IGM). The detection of Ly damping wing absorption imprint…
HeII Ly Transmission Spikes and Absorption Troughs in Eight High-resolution Spectra Probing the End of HeII Reionization
Kirill Makan, Gábor Worseck, Frederick B. Davies +3
We present statistics of HeII Lya transmission spikes and large-scale absorption troughs using archival high-resolution (-) far-UV spectra of eight HeI…
Improving IGM temperature constraints using wavelet analysis on high-redshift quasars
Molly Wolfson, Joseph F. Hennawi, Frederick B. Davies +3
The thermal state of the intergalactic medium (IGM) contains vital information about the epoch of reionization, one of the most transformative yet poorly understood periods in the…
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…
Constraints on the End of Reionization from the Density Fields Surrounding Two Highly Opaque Quasar Sightlines
Holly M. Christenson, George D. Becker, Steven R. Furlanetto +5
The observed large-scale scatter in Lyman opacity of the intergalactic medium at implies large fluctuations in the neutral hydrogen fraction that are unexpected long afte…
Chasing the Tail of Cosmic Reionization with Dark Gap Statistics in the Ly Forest over
Yongda Zhu, George D. Becker, Sarah E. I. Bosman +14
We present a new investigation of the intergalactic medium (IGM) near the end of reionization using "dark gaps" in the Lyman-alpha (Ly) forest. Using spectra of 55 QSOs at $z_{\…
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…
Hydrogen reionisation ends by : Lyman- optical depth measured by the XQR-30 sample
Sarah E. I. Bosman, Frederick B. Davies, George D. Becker +23
The presence of excess scatter in the Ly- forest at , together with the existence of sporadic extended opaque Gunn-Peterson troughs, has started to provide robust evi…
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 Predicament of Absorption-Dominated Reionization: Increased Demands on Ionizing Sources
Frederick B. Davies, Sarah E. I. Bosman, Steven R. Furlanetto +2
The reionization epoch concludes when ionizing photons reach every corner of the Universe. Reionization has generally been assumed to be limited primarily by the rate at which gala…
The discovery of a highly accreting, radio-loud quasar at z=6.82
Eduardo Banados, Chiara Mazzucchelli, Emmanuel Momjian +17
Radio sources at the highest redshifts can provide unique information on the first massive galaxies and black holes, the densest primordial environments, and the epoch of reionizat…
Improved treatments of the ionizing photon mean free path in semi-numerical simulations of reionization
Frederick B. Davies, Steven R. Furlanetto
Efficient and accurate simulations of the reionization epoch are crucial to exploring the vast uncharted parameter space that will soon be constrained by measurements of the 21 cm…
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…