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19 April 2024

» arxiv » astro-ph/0108068

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Properties of a Chemically Enriched Lya Absorption System at z=0.167 and Implications for the Total Baryons in Extended Gaseous Envelopes Around Galaxies
Hsiao-Wen Chen ; Jason X. Prochaska ; Kenneth M. Lanzetta ;
Date:	4 Aug 2001
Subject:	astro-ph
Affiliation:	Carnegie Observatories; SUNY at Stony Brook
Abstract:	We present a detailed analysis of the chemical abundances, ionization state, and origin of a partial Lyman limit system (N(HI) ~ 10^{16} cm^{-2}) at low redshift (z=0.167 towards PKS0405-1219). We also present the first estimate of the total baryons in extended gaseous envelopes around galaxies based on a simple photoionization model for the Lya absorbers. We find that extended gaseous envelopes can explain between 5--20% of the total baryons predicted by the big bang nucleosynthesis model.
Source:	arXiv, astro-ph/0108068
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