Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-11-15
Astrophys.J.640:41-46,2006
Astronomy and Astrophysics
Astrophysics
15 pages including 4 figures, accepted for publication in ApJ
Scientific paper
10.1086/499769
Nucleosynthetic signatures in common between the gas responsible for the high redshift Lyman alpha forest and a subsample of extremely metal poor stars are found. A simple mass loss model of chemical evolution with physically motivated parameters provides a consistent picture in which the gas is identified with that lost by supernova-driven winds during the first generation of star formation. Substantial mass loss occurs which can account for a diffuse IGM with up to 80% of the total baryon content and a peak [C-O/H] abundance of \~-2.9. This mass loss component differs from one produced later during galaxy formation and evolution that contributes to a circum-galactic medium (CGM). The CGM was shown earlier to have a mass of ~10% of all baryons and peak [Fe/H]~-1.
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