321 citations · 6.3k across the 122 of their papers we have counts for
12 papers · 1 filter
Extragalactic 85Rb/87Rb and 6Li/7Li ratios in the Small Magellanic Cloud
P. Molaro, P. Bonifacio, G. Cupani +1
The line of sight toward Sk 143 (AzV 456), an O9.5 Ib star in the Small Magellanic Cloud (SMC), shows significant absorption from neutral atoms and molecules. We report a new study…
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…
The First Data Release of the KODIAQ Survey
J. M. O'Meara, N. Lehner, J. C. Howk +6
We present and make publicly available the first data release (DR1) of the Keck Observatory Database of Ionized Absorption toward Quasars (KODIAQ) survey. The KODIAQ survey is aime…
Galactic and Circumgalactic OVI and its Impact on the Cosmological Metal and Baryon Budgets at 2<z<3.5
Nicolas Lehner, John M. O'Meara, Andrew J. Fox +4
We present the first results from our NASA Keck Observatory Database of Ionized Absorbers toward Quasars (KODIAQ) survey which aims to characterize the properties of the highly ion…
The High-Ion Content and Kinematics of Low-Redshift Lyman Limit Systems
Andrew J. Fox, Nicolas Lehner, Jason Tumlinson +9
We study the high-ionization phase and kinematics of the circumgalactic medium around low-redshift galaxies using a sample of 23 Lyman Limit Systems (LLSs) at 0.08<z<0.93 observed…
The Bimodal Metallicity Distribution of the Cool Circumgalactic Medium at z<1
N. Lehner, J. C. Howk, T. M. Tripp +7
We assess the metal content of the cool (10^4 K) circumgalactic medium (CGM) about galaxies at z<1 using an H I-selected sample of 28 Lyman limit systems (LLS, defined here as abso…
Project Lyman: Quantifying 11 Gyrs of Metagalactic Ionizing Background Evolution
Stephan R. McCandliss, B-G Andersson, Nils Bergvall +23
The timing and duration of the reionization epoch is crucial to the emergence and evolution of structure in the universe. The relative roles that star-forming galaxies, active gala…
QSO Absorption Systems Detected in Ne VIII: High-Metallicity Clouds with a Large Effective Cross Section
Joseph D. Meiring, Todd M. Tripp, Jessica K. Werk +5
Using high resolution, high signal-to-noise ultraviolet spectra of the z = 0.9754 quasar PG1148+549 obtained with the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescop…
The Hidden Mass and Large Spatial Extent of a Poststarburst Galaxy Outflow
Todd M. Tripp, Joseph D. Meiring, J. Xavier Prochaska +9
Outflowing winds of multiphase plasma have been proposed to regulate the buildup of galaxies, but key aspects of these outflows have not been probed with observations. Using ultrav…
The Interstellar Medium and Star Formation in Edge-On Galaxies. I. NGC 891
Kijeong Yim, Tony Wong, J. Christopher Howk +1
We analyze images of BIMA 12CO (J = 1 --> 0), VLA HI, and Spitzer 3.6 and 24 \mum emission toward the edge-on galaxy NGC 891 and derive the radial and vertical distributions of gas…
Wavelength Accuracy of the Keck HIRES Spectrograph and Measuring Changes in the Fine Structure Constant
Kim Griest, Jonathan B. Whitmore, Arthur M. Wolfe +3
We report on an attempt to accurately wavelength calibrate four nights of data taken with the Keck HIRES spectrograph on QSO PHL957, for the purpose of determining whether the fine…
Strong z~0.5 O VI Absorption Toward PKS 0405-123: Implications for Ionization and Metallicity of the Cosmic Web
J. Christopher Howk, Joseph S. Ribaudo, Nicolas Lehner +2
We present observations of the O VI system at z_abs = 0.495096 toward PKS 0405-123 (z_em = 0.5726) obtained with FUSE and STIS. In addition to strong O VI, with log N(O VI) = 14.47…