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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…
A Fundamental Test for Galaxy Formation Models: Matching the Lyman- Absorption Profiles of Galactic Halos over Three Decades in Distance
Daniele Sorini, José Oñorbe, Joseph F. Hennawi +1
Galaxy formation depends critically on the physical state of gas in the circumgalactic medium (CGM) and its interface with the intergalactic medium (IGM), determined by the complex…
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…