2001/11/15 by Chris Churchill, Jane Rigby, Churchill, Chris +5
Engineering · Materials Science · Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Optical properties and cooling technologies in crystalline materials #Solid State Laser Technologies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0111315
to appear in Proceedings for the XVIIth IAP Colloquium: Gaseous Matter in Galaxies and Intergalactic Space (held 19-23 June 2001)
arxiv created 2001/11/15 · openalex publication_date 2001/11/15 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report on a population of absorption systems selected by the presence of very weak Mg II doublets. A sub-population of these systems are iron enriched and have near solar metallicities. This would indicated advanced stages (i.e. few Gyr) of in situ star formation within the absorbing structures. From photoionization modeling, we infer low ionization fractions of f(HI/H)~0.01, and gas densities of ~0.1 cm-3. Since the maximum HI column densities are \~1017 cm-2, the inferred cloud sizes are ~10 pc. From their redshift number densities, this implies that their co-moving spatial density outnumbers normal bright galaxies by a factor of a few million.