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11 papers · 2 filters
The Deuterium Abundance Towards Q1937-1009
Scott Burles, David Tytler
We present a new measurement of the deuterium-to-hydrogen ratio (D/H) in the Lyman limit absorption system at towards Q1937--1009. We use an improved method to measure…
The Deuterium Abundance Towards Q1009+2956
Scott Burles, David Tytler
We present a measurement of the deuterium to hydrogen ratio (D/H) in a metal-poor absorption system at redshift towards the QSO 1009+2956. We apply the new method of Burl…
On the Evolution of Damped Lyman Alpha Systems to Galactic Disks
Arthur M. Wolfe, Jason X. Prochaska
The mean metallicity of the thick disk of the Galaxy is 0.5 dex higher than that of the damped Lyman alpha systems. This has been interpreted to argue that stars in the former do n…
The Lensing Cluster MS0440+0204 Seen by HST, ROSAT and ASCA: I. Cluster Properties
I. M. Gioia, E. J. Shaya, O. Le Fevre +3
We present an analysis of the properties of the lensing cluster MS0440+0204 at z=0.1965. MS0440+0204 has been observed with a variety of telescopes at diverse wavelengths: from the…
A Lower Limit to the Universal Density of Metals at z \sim 3
Antoinette Songaila
Column density distribution functions of CIV with 12.05 < log (N) < 14.35 and SiIV with 11.70 < log (N) < 13.93 have been obtained using 81 CIV absorbers and 35 SiIV absorbers redw…
A Very Hot, High Redshift Cluster of Galaxies: More Trouble for Omega_0 = 1
Megan Donahue, G. Mark Voit, Isabella M. Gioia +3
We have observed the most distant (z=0.829) cluster of galaxies in the Einstein Extended Medium Sensitivity Survey, with the ASCA and ROSAT satellites. We find an X-ray temperature…