Damped Lyman Alpha Systems at z<1.65: The Expanded SDSS HST Sample

Details Damped Lyman Alpha Systems at z<1.65: The Expanded SDSS HST Sample Damped Lyman Alpha Systems at z<1.65: The Expanded SDSS HST Sample

2005-09-15

arxiv.org/abs/astro-ph/0509469v1

Astrophys.J.636:610-630,2006

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ. 22 pages, 22 figures

Scientific paper

10.1086/498132

We present results of our HST Cycle 11 Survey for low-redshift (z<1.65) DLAs in the UV spectra of quasars selected from the SDSS Early Data Release. These quasars have strong intervening MgII-FeII systems which are known signatures of high column density neutral gas. In total, UV observations of Ly-alpha absorption in 197 MgII systems with z<1.65 and rest equivalent width (REW) W2796 \ge 0.3A have now been obtained. The main results are: (1) 36(+/- 6)% of systems with W2796 \ge 0.5 A and FeII W2600 \ge 0.5 A are DLAs. This increases to 42(+/- 7)% for systems with W2796/W2600 < 2 and MgI W2852 > 0.1 A. (2) The mean N(HI) of MgII systems with 0.3 A \le W2796 < 0.6 A is a factor of ~36 lower than that of systems with W2796 \ge 0.6 A. (3) The DLA incidence per unit redshift is consistent with no evolution for z <~ 2 (Omega_L=0.7, Omega_M = 0.3), but exhibits significant evolution for z >~ 2. (4) Omega_{DLA} is constant for 0.5

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