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astro-ph1998
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…
astro-ph1998
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…
astro-ph1998
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…