J. Xavier Prochaska

TL;DR: In this paper, the authors analyzed the physical conditions of the cool, photoionized (T ∼ 10 4 K) circumgalactic medium (CGM) using the COS-Halos suite of gas column density measurements for 44 gaseous halos within 160 kpc of L ∼ L ∗ galaxies at z ∼ 0.2.

TL;DR: The COS-Halos survey as discussed by the authors is a systematic investigation of the gaseous halos of 44 z = 0.15-0.35 galaxies using background QSOs observed with the Cosmic Origins Spectrograph aboard the Hubble Space Telescope.

TL;DR: In this article, chemical abundance measurements for 47 damped Lyα (DLA) systems, 30 at z > 4, observed with the Echellette Spectrograph and Imager and the High Resolution Echelle Spectrometer on the Keck telescopes are presented.

TL;DR: In this article, the frequency distribution of projected H I column densities f(N H I, X), total comoving covering fraction, and integrated mass densities ρH I of high-redshift, H I galactic gas from a survey of damped Lyα systems (DLAs) in the Sloan Digital Sky Survey, Data Release 5.2-5 (738 DLAs), is well fitted by a double power law with a break column density Nd = 1021.55±0.04 cm-2 and low/high-end exponents α =

TL;DR: In this paper, the authors analyzed Mg II λλ2796, 2803 and Fe II −λ2586, 2600 absorption profiles in individual spectra of 105 galaxies at 0.3 50° (edge-on) and found that biconical outflows are ubiquitous in normal, star-forming galaxies at z ~ 0.5.