Galactic winds and transport of metals into the IGM in semi-analytic simulations

Details Galactic winds and transport of metals into the IGM in semi-analytic simulations Galactic winds and transport of metals into the IGM in semi-analytic simulations

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..329p...6b&link_type=abstract

Starbursts: From 30 Doradus to Lyman Break Galaxies, Held in Cambridge, UK, 6-10 September 2004. Edited by R. de Grijs and R.M.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We use a semi-analytic treatment of galactic winds within high-resolution, large-scale cosmological N-body simulations of a ΛCDM Universe to investigate the chemical enrichment history of the intergalactic medium (IGM). We follow the evolution of superbubbles and supershells powered by supernova explosions in a spherical region of space with diameter 52 h-1 Mpc and mean density close to the mean density of the Universe, from z=20 down to z=0. The volume filling factor and the fraction of IGM mass affected by winds are calculated as a function of redshift, and of the two model parameters. Our results suggest that galactic winds may not significantly affect the global properties of the Lyα forest. The mass-loading efficiency of the outflows is a key factor to determine the evolution of winds and their global impact on the IGM: the higher the mass loading, the later the IGM is enriched with metals. Galaxies with 109 < Mstar < 1010 M&sun; are responsible for most of the metals ejected into the IGM at z=3, while galaxies with Mstar < 109 M&sun; give a non-negligible contribution only at higher redshifts, when larger galaxies have not yet assembled.

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