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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 Detection of ~2.3 Cosmic Voids from 3D Lyman- Forest Tomography in the COSMOS Field
Alex Krolewski, Khee-Gan Lee, Martin White +10
We present the most distant detection of cosmic voids () and the first detection of three-dimensional voids in the Lyman- forest. We used a 3D tomographic map of the…
DESCQA: An Automated Validation Framework for Synthetic Sky Catalogs
Yao-Yuan Mao, Eve Kovacs, Katrin Heitmann +24
The use of high-quality simulated sky catalogs is essential for the success of cosmological surveys. The catalogs have diverse applications, such as investigating signatures of fun…
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…
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…