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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…
The Lyman Alpha Forest in the Spectra of QSOs
Michael Rauch
Observations of redshifted Lyman alpha forest absorption in the spectra of quasistellar objects (QSOs) provide a highly sensitive probe of the distribution of gaseous matter in the…
First Comparison of Ionization and Metallicity in Two Lines of Sight Toward HE 1104-1805 AB at z=1.66
Sebastian Lopez, Dieter Reimers, Michael Rauch +2
Using new HST/FOS, NTT/EMMI, and Keck/HIRES spectra of the gravitationally-lensed double QSO HE 1104-1805 AB (z=2.31, θ=3.2), and assuming UV photoionization by a metagalactic radi…
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…