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A Deep Search For Faint Galaxies Associated With Very Low-redshift C IV Absorbers: III. The Mass- and Environment-dependent Circumgalactic Medium
Joseph N. Burchett, Todd M. Tripp, Rongmon Bordoloi +6
Using Hubble Space Telescope Cosmic Origins Spectrograph observations of 89 QSO sightlines through the Sloan Digital Sky Survey footprint, we study the relationships between C IV a…
Possible Population III Remnants at Redshift 3.5
Neil H. M. Crighton, John M. O'Meara, Michael T. Murphy
The first stars, known as Population III (PopIII), produced the first heavy elements, thereby enriching their surrounding pristine gas. Previous detections of metals in intergalact…
The physical properties of z>2 Lyman limit systems: new constraints for feedback and accretion models
Michele Fumagalli, John M. O'Meara, J. Xavier Prochaska
We study the physical properties of a homogeneous sample of 157 optically-thick absorption line systems at redshifts ~1.8-4.4, selected from a high-dispersion spectroscopic survey…
A New Constraint on the Physical Nature of Damped Lyman Alpha Systems
Jeff Cooke, John O'Meara
The formation and evolution of galaxies require large reservoirs of cold, neutral gas. The damped Lya systems (DLAs), seen in absorption towards distant quasars and gamma-ray burst…
A Deep Search For Faint Galaxies Associated With Very Low-redshift C IV Absorbers: II. Program Design, Absorption-line Measurements, and Absorber Statistics
Joseph N. Burchett, Todd M. Tripp, J. Xavier Prochaska +6
To investigate the evolution of metal-enriched gas over recent cosmic epochs as well as to characterize the diffuse, ionized, metal-enriched circumgalactic medium (CGM), we have co…
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…