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**TITLE** ASP Conference Series, Vol. **VOLUME**, **PUBLICATION YEAR** **EDITORS** Enrichment of the High-Redshift IGM by Galactic Winds

By Anthony Aguirre, Joop Schaye, Lars Hernquist, David H. Weinberg, Neal Katz and Jeffrey Gardner


Abstract. This paper discusses a semi-numerical method of investigating the enrichment of the intergalactic medium by galactic winds. We find that most galaxies at z ∼> 3 should be driving winds, and that (if these winds are similar to those at low z) these winds should escape to large distances. Our calculations – which permit exploration of a large region of model parameter space – indicate that the wind velocity, the mass of the wind-driving galaxies, the fraction of ambient material entrained, and the available time (between wind launch and the observed redshift) all affect wind propagation significantly; other physical effects can be important but are sub-dominant. We find that under reasonable assumptions, the enrichment by 3 ∼ < z ∼ < 6 galaxies could account for the quantity of metals seen in the Lyα forest, though it is presently unclear whether this enrichment is compatible with the intergalactic medium’s detailed metal distribution or relative quiescence. 1

Year: 2001
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