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Discovery of three new near-pristine absorption clouds at -4.4
P. Frédéric Robert, Michael T. Murphy, John M. O'Meara +2
We report the discovery of three new "near-pristine" Lyman Limit Systems (LLSs), with metallicities ~1/1000 solar, at redshifts 2.6, 3.8 and 4.0, with a targeted survey at the Keck…
The Third Data Release of the KODIAQ Survey
John M. O'Meara, Nicolas Lehner, J. Christopher Howk +1
We present and make publicly available the third data release (DR3) of the Keck Observatory Database of Ionized Absorption toward Quasars (KODIAQ) survey. KODIAQ DR3 consists of a…
A New Measurement of the Temperature Density Relation of the IGM From Voigt Profile Fitting
Hector Hiss, Michael Walther, Joseph F. Hennawi +3
We decompose the Lyman-α (Lyα) forest of an extensive sample of 74 high signal-to-noise ratio and high-resolution quasar spectra into a collection of Voigt profiles. Absorbers loca…
A New Precision Measurement of the Small-Scale Line-of-Sight Power Spectrum of the Ly Forest
Michael Walther, Joseph F. Hennawi, Hector Hiss +4
We present a new measurement of the Ly forest power spectrum at using 74 Keck/HIRES and VLT/UVES high-resolution, high-S/N quasar spectra. We developed a custom…
The Keck+Magellan Survey for Lyman Limit Absorption III: Sample Definition and Column Density Measurements
J. Xavier Prochaska, John M. O'Meara, Michele Fumagalli +2
We present an absorption-line survey of optically thick gas clouds -- Lyman Limit Systems (LLSs) -- observed at high dispersion with spectrometers on the Keck and Magellan telescop…
The Neutral Hydrogen Cosmological Mass Density at z=5
Neil H. M. Crighton, Michael T. Murphy, J. Xavier Prochaska +8
We present the largest homogeneous survey of damped Lyman- systems (DLAs) using the spectra of 163 QSOs that comprise the Giant Gemini GMOS (GGG) survey. With this surve…