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Reionization history constraints from neural network based predictions of high-redshift quasar continua
D. Ďurovčíková, H. Katz, S. E. I. Bosman +3
Observations of the early Universe suggest that reionization was complete by , however, the exact history of this process is still unknown. One method for measuring the evo…
The REQUIEM Survey I: A Search for Extended Ly-Alpha Nebular Emission Around 31 z>5.7 Quasars
Emanuele Paolo Farina, Fabrizio Arrigoni-Battaia, Tiago Costa +19
The discovery of quasars few hundred megayears after the Big Bang represents a major challenge to our understanding of black holes and galaxy formation and evolution. Their luminos…
Evidence for Low Radiative Efficiency or Highly Obscured Growth of Quasars
Frederick B. Davies, Joseph F. Hennawi, Anna-Christina Eilers
The supermassive black holes (SMBHs) observed at the centers of all massive galaxies are believed to have grown via luminous accretion during quasar phases in the distant past. The…
Anomaly in the Opacity of the Post-Reionization Intergalactic Medium in the Ly and Ly Forest
Anna-Christina Eilers, Joseph F. Hennawi, Frederick B. Davies +1
We measure the intergalactic medium (IGM) opacity in the Ly as well as in the Ly forest along quasar sightlines between , probing th…
Ionization bias and the ghost proximity effect near quasars in the shadow of proximate absorption systems
Frederick B. Davies
The larger-than-expected scatter in the opacity of the Ly forest suggests that the metagalactic ionizing background is strongly fluctuating at . Models for ionizing bac…
Time-dependent behaviour of quasar proximity zones at
Frederick B. Davies, Joseph F. Hennawi, Anna-Christina Eilers
Since the discovery of quasars two decades ago, studies of their Ly-transparent proximity zones have largely focused on their utility as a probe of cosmic reionization…
Astro2020 Science White Paper: Insights Into the Epoch of Reionization with the Highly-Redshifted 21-cm Line
Steven Furlanetto, Chris L. Carilli, Jordan Mirocha +47
The epoch of reionization, when photons from early galaxies ionized the intergalactic medium about a billion years after the Big Bang, is the last major phase transition in the Uni…
Astro2020 Science White Paper: Synergies Between Galaxy Surveys and Reionization Measurements
Steven Furlanetto, Adam Beardsley, Chris L. Carilli +47
The early phases of galaxy formation constitute one of the most exciting frontiers in astrophysics. It is during this era that the first luminous sources reionize the intergalactic…
Astro 2020 Science White Paper: Fundamental Cosmology in the Dark Ages with 21-cm Line Fluctuations
Steven Furlanetto, Judd D. Bowman, Jordan Mirocha +43
The Dark Ages are the period between the last scattering of the cosmic microwave background and the appearance of the first luminous sources, spanning approximately 1100 < z < 30.…
Studying the Reionization Epoch with QSO Absorption Lines
George D. Becker, Anson D'Aloisio, Frederick B. Davies +2
Absorption signatures in the spectra of QSOs are one of our most powerful tools for studying galactic and intergalactic environments at high redshifts. With the discovery of QSOs o…
Cosmic Dawn and Reionization: Astrophysics in the Final Frontier
Asantha Cooray, James Aguirre, Yacine Ali-Haimoud +71
The cosmic dawn and epoch of reionization mark the time period in the universe when stars, galaxies, and blackhole seeds first formed and the intergalactic medium changed from neut…
A metal-poor damped Ly-alpha system at redshift 6.4
Eduardo Banados, Michael Rauch, Roberto Decarli +9
We identify a strong Ly-alpha damping wing profile in the spectrum of the quasar P183+05 at z=6.4386. Given the detection of several narrow metal absorption lines at z=6.40392, the…