66 citations · 238 across the 6 of their papers we have counts for
6 papers
The COS CGM Compendium. III: Metallicity and Physical Properties of the Cool Circumgalactic Medium at z<1
Nicolas Lehner, Christopher B. Wotta, J. Christopher Howk +3
We characterize the metallicities and physical properties of cool, photoionized gas in a sample of 152 z<1 strong Lya forest systems (SLFSs, absorbers with 15<log N(HI)<16.2). The…
The Red Dead Redemption Survey of Circumgalactic Gas About Massive Galaxies. I. Mass and Metallicity of the Cool Phase
Michelle A. Berg, J. Christopher Howk, Nicolas Lehner +6
We present a search for HI in the circumgalactic medium (CGM) of 21 massive (), luminous red galaxies (LRGs) at . Using UV spectro…
The COS CGM Compendium (CCC). I: Survey Design and Initial Results
Nicolas Lehner, Christopher B. Wotta, J. Christopher Howk +3
We present a neutral hydrogen-selected absorption-line survey of gas with HI column densities 15<log N(HI)<19 at z<1 using the Cosmic Origins Spectrograph on the Hubble Space Teles…
Extraplanar H II Regions in Spiral Galaxies. II. In Situ Star Formation in the Interstellar Thick Disk of NGC 4013
J. Christopher Howk, Katherine M. Rueff, Nicolas Lehner +3
We present observations of an H emitting knot in the thick disk of NGC 4013, demonstrating it is an H II region surrounding a cluster of young hot stars pc above the p…
Project AMIGA: A Minimal Covering Factor for Optically Thick Circumgalactic Gas Around the Andromeda Galaxy
J. Christopher Howk, Christopher B. Wotta, Michelle A. Berg +19
We present a deep search for HI 21-cm emission from the gaseous halo of Messier 31 as part of Project AMIGA, a large program Hubble Space Telescope program to study the circumgalac…
Low-metallicity Absorbers Account for Half of the Dense Circumgalactic Gas at z < 1
Christopher B. Wotta, Nicolas Lehner, J. Christopher Howk +2
We present an analysis of the metallicity distribution of the dense circumgalactic medium (CGM) of galaxies at 0.1 < z < 1.1 as probed by partial Lyman limit systems (pLLSs, 16.1 <…