187 citations · 681 across the 16 of their papers we have counts for
16 papers
Probing Inhomogeneity in the Helium Ionizing UV Background
Sean Morrison, Matthew M. Pieri, David Syphers +1
We present an analysis combining the simultaneous measurement of intergalactic absorption by hydrogen (H I), helium (He II) and oxygen (O VI) in UV and optical quasar spectra. The…
A Galaxy Redshift Survey near HST/COS AGN Sight Lines
Brian A. Keeney, John T. Stocke, Cameron T. Pratt +8
To establish the connection between galaxies and UV-detected absorption systems in the local universe, a deep () and wide ( radius) galaxy redshift survey…
Characteristics of He II Proximity Profiles
W. Zheng, D. Syphers, A. Meiksin +4
The proximity profile in the spectra of z~3 quasars, where fluxes extend blueward of the He II Lya wavelength 304 (1+z) A, is one of the most important spectral features in the stu…
Absorption-Line Detections of K Gas in Spiral-Rich Groups of Galaxies
J. T. Stocke, B. A. Keeney, C. W. Danforth +10
Using the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) the COS Science Team has conducted a high signal-to-noise survey of 14 bright QSOs. In a previous pa…
An HST/COS Survey of the Low-Redshift IGM. I. Survey, Methodology, & Overall Results
Charles W. Danforth, Brian A. Keeney, Evan M. Tilton +12
We use high-quality, medium-resolution {\it Hubble Space Telescope}/Cosmic Origins Spectrograph (\HST/COS) observations of 82 UV-bright AGN at redshifts to construct…
HST/COS Observations of the Quasar Q0302-003: Probing the He II Reionization Epoch and QSO Proximity Effects
David Syphers, J. Michael Shull
Q0302-003 () was the first quasar discovered that showed a He II Gunn-Peterson trough, a sign of incomplete helium reionization at . We present its HS…