Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-08-03
Astronomy and Astrophysics
Astrophysics
10 pages, 4 figures, to appear in ``Extragalactic Gas at Low Redshift'', ed. J. Mulchaey and J. Stocke, ASP Conf. Serie
Scientific paper
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.
Chen Hsiao-Wen
Lanzetta Kenneth M.
Prochaska Jason Xavier
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