The Population of Weak MgII Absorbers. II The Properties of Single-Cloud Systems

Details The Population of Weak MgII Absorbers. II The Properties of Single-Cloud Systems The Population of Weak MgII Absorbers. II The Properties of Single-Cloud Systems

2001-10-08

arxiv.org/abs/astro-ph/0110191v1

Astronomy and Astrophysics

Astrophysics

48 pages, 10 figures, accepted to the Astrophysical Journal

Scientific paper

10.1086/324723

We present an investigation of MgII absorbers characterized as single-cloud weak systems at z~1. We measured column densities and Doppler parameters for MgII and FeII in 15 systems found in HIRES/Keck spectra at 6.6 km/s. Using these quantities and CIV, Lyman alpha and Lyman limit absorption observed with FOS/HST (resolution ~230 km/s) we applied photoionization models to each system to constrain metallicities, densities, ionization conditions, and sizes. We find that: (1) Single-cloud weak systems are optically thin in neutral hydrogen and may have their origins in a population of objects distinct from the optically thick strong MgII absorbers, which are associated with bright galaxies. (2) Weak systems account for somewhere between 25% to 100% of the z < 1 Lyman alpha forest clouds in the range 15.8

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