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Glimpses of the Interstellar Medium at Redshift 3.5
Michael Rauch, Wallace L. W. Sargent, Thomas A. Barlow
We have obtained high resolution (FWHM = 4.4 km/s) Keck spectra of images A and C of the gravitationally lensed QSO Q1422+231. The images are separated by 1.3" on the sky. In an ab…
Metallic Absorbers and the Evolution of Galaxy Haloes and the Metagalactic Ionizing Background
Alec Boksenberg, Wallace L. W. Sargent, Michael Rauch
An extremely careful separation of the weak metal-line systems relating to the Lyman forest absorbers into individual ``single-phase ionization'' components with accurate parameter…
Weighing Superclusters
Chung-Pei Ma, Todd A. Small, Wallace L. W. Sargent
We present a summary report on a detailed study of the mass and dynamical state of the Corona Borealis supercluster using the largest redshift survey of this object to date. Extens…
The Metal Contents of Very Low Column Density Lyman-alpha Clouds: Implications for the Origin of Heavy Elements in the Intergalactic Medium
Limin Lu, Wallace L. W. Sargent, Thomas A. Barlow +1
We investigate the metal contents of Lyman-alpha clouds at 2.2<z<3.6 with 10^13.5<N(HI)<10^14 cm-2 using high resolution, high S/N spectra of 9 quasars obtained with the 10m Keck I…