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An 800-million-solar-mass black hole in a significantly neutral Universe at redshift 7.5
E. Bañados, B. P. Venemans, C. Mazzucchelli +15
Quasars are the most luminous non-transient objects known and as a result they enable studies of the Universe at the earliest cosmic epochs. Despite extensive efforts, however, the…
Modeling the HeII Transverse Proximity Effect: Constraints on Quasar Lifetime and Obscuration
Tobias M. Schmidt, Joseph F. Hennawi, Gábor Worseck +3
The HeII transverse proximity effect - enhanced HeII Lyα transmission in a background sightline caused by the ionizing radiation of a foreground quasar - offers a unique opportunit…
Determining the Nature of Late Gunn-Peterson Troughs with Galaxy Surveys
Frederick B. Davies, George D. Becker, Steven R. Furlanetto
Recent observations have discovered long (up to ~110 Mpc/h), opaque Gunn-Peterson troughs in the z ~ 5.5 Lyman-alpha forest, which are challenging to explain with conventional mode…
Small-scale Intensity Mapping: Extended Halos as a Probe of the Ionizing Escape Fraction and Faint Galaxy Populations during Reionization
Lluís Mas-Ribas, Joseph F. Hennawi, Mark Dijkstra +3
We present a new method to quantify the value of the escape fraction of ionizing photons, and the existence of ultra-faint galaxies clustered around brighter objects during the epo…
A self-consistent 3D model of fluctuations in the helium-ionizing background
Frederick B. Davies, Steven R. Furlanetto, Keri L. Dixon
Large variations in the effective optical depth of the He II Ly forest have been observed at , but the physical nature of these variations is uncertain: either the…
A New Method to Measure the Post-Reionization Ionizing Background from the Joint Distribution of Lyman- and Lyman- Forest Transmission
Frederick B. Davies, Joseph F. Hennawi, Anna-Christina Eilers +1
The amplitude of the ionizing background that pervades the intergalactic medium (IGM) at the end of the epoch of reionization provides a valuable constraint on the emissivity of th…
Implications of Quasar Proximity Zones for the Epoch of Reionization and Quasar Lifetimes
Anna-Christina Eilers, Frederick B. Davies, Joseph F. Hennawi +3
We study quasar proximity zones in the redshift range by homogeneously analyzing medium resolution spectra, encompassing both archival and newly obtain…