219 citations · 1.7k across the 36 of their papers we have counts for
11 papers · 1 filter
Metal-Poor, Cool Gas in the Circumgalactic Medium of a z = 2.4 Star-Forming Galaxy: Direct Evidence for Cold Accretion?
Neil H. M. Crighton, Joseph F. Hennawi, J. Xavier Prochaska
In our current galaxy formation paradigm, high-redshift galaxies are predominantly fuelled by accretion of cool, metal-poor gas from the intergalactic medium. Hydrodynamical simula…
Precious Metals in SDSS Quasar Spectra II: Tracking the Evolution of Strong, 0.4 < z < 2.3 MgII Absorbers with Thousands of Systems
Eduardo N. Seyffert, Kathy L. Cooksey, Robert A. Simcoe +3
We have performed an analysis of over 34,000 MgII doublets at 0.36 < z < 2.29 in Sloan Digital Sky Survey (SDSS) Data-Release 7 quasar spectra; the catalog, advanced data products,…
The Fundamental Plane of Damped Lyman Alpha Systems
Marcel Neeleman, Arthur M. Wolfe, J. Xavier Prochaska +1
Using a sample of 100 H I - selected damped Lyman alpha (DLA) systems, observed with the High Resolution Echelle Spectrometer on the Keck I telescope, we present evidence that the…
A Substantial Mass of Cool, Metal-Enriched Gas Surrounding the Progenitors of Modern-Day Ellipticals
J. Xavier Prochaska, Joseph F. Hennawi, Robert A. Simcoe
The hosts of luminous z~2 quasars evolve into today's massive elliptical galaxies. Current theories predict that the circum-galactic medium (CGM) of these massive, dark-matter halo…
The circumgalactic medium of massive galaxies at z~3: a test for stellar feedback, galactic outflows, and cold streams
Sijing Shen, Piero Madau, Javiera Guedes +3
We present new results on the kinematics, thermal and ionization state, and spatial distribution of metal-enriched gas in the circumgalactic medium (CGM) of massive galaxies at red…
The HST/ACS+WFC3 Survey for Lyman Limit Systems II: Science
John M. O'Meara, J. Xavier Prochaska, Gabor Worseck +2
We present the first science results from our Hubble Space Telescope Survey for Lyman limit absorption systems (LLS) using the low dispersion spectroscopic modes of the Advanced Ca…
Evidence for Cold Accretion: Primitive Gas Flowing onto a Galaxy at z~0.274
Joseph Ribaudo, Nicolas Lehner, J. Christopher Howk +5
We present UV and optical observations from the Cosmic Origins Spectrograph on the Hubble Space Telescope and Keck of a z= 0.27395 Lyman limit system (LLS) seen in absorption again…
Multiphase Gas In Galaxy Halos: The OVI Lyman-limit System toward J1009+0713
J. Tumlinson, J. K. Werk, C. Thom +6
We have serendipitously detected a strong O VI-bearing Lyman limit system at z_abs = 0.3558 toward the QSO J1009+0713 (z_em = 0.456) in our survey of low-redshift galaxy halos with…
Shining Light on Merging Galaxies I: The Ongoing Merger of a Quasar with a `Green Valley' Galaxy
Robert L. da Silva, J. Xavier Prochaska, David Rosario +2
Serendipitous observations of a pair z = 0.37 interacting galaxies (one hosting a quasar) show a massive gaseous bridge of material connecting the two objects. This bridge is photo…
GALEX far-UV color selection of UV-bright high-redshift quasars
Gábor Worseck, J. Xavier Prochaska
We study the small population of z>2.7 quasars detected by GALEX, whose far-UV emission is not extinguished by intervening HI Lyman limit systems. These quasars are of particular i…
Direct Evidence of Cold Gas in DLA 0812+32B
Regina A. Jorgenson, Arthur M. Wolfe, J. Xavier Prochaska +1
We present the first direct evidence for cold gas in a high redshift DLA galaxy. We measured several multiplets of weak neutral carbon (CI) transitions in order to perform a curve…