Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-02
Mon.Not.Roy.Astron.Soc.359:1201-1216,2005
Astronomy and Astrophysics
Astrophysics
18 pages, 15 figures. Major changes in the model. Manuscript with high resolution figures available upon request. MNRAS in pre
Scientific paper
10.1111/j.1365-2966.2005.08772.x
We present a semi-analytic treatment of galactic winds within high resolution, large scale cosmological N-body simulations of a LCDM Universe. The evolution of winds is investigated by following the expansion of supernova driven superbubbles around the several hundred thousand galaxies that form in an approximately spherical region of space with diameter 52 Mpc/h and mean density close to the mean density of the Universe. We focus our attention on the impact of winds on the diffuse intergalactic medium. Initial conditions for mass loss at the base of winds are taken from Shu, Mo and Mao (2003). Results are presented for the volume filling factor and the mass fraction of the IGM affected by winds and their dependence on the model parameters is carefully investigated. The mass loading efficiency of bubbles 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 10^9 < M_* < 10^10 M_sun are responsible for most of the metals ejected into the IGM at z=3, while galaxies with M_* < 10^9 M_sun give a non negligible contribution only at higher redshifts, when larger galaxies have not yet assembled. We find a higher mean IGM metallicity than Lyalpha forest observations suggest and we argue that the discrepancy may be explained by the high temperatures of a large fraction of the metals in winds, which may not leave detectable imprints in absorption in the Lyalpha forest.
Bertone Serena
Stoehr Felix
White Simon D. M.
No associations
LandOfFree
Semi-analytic Simulations of Galactic Winds: Volume Filling Factor, Ejection of Metals and Parameter Study does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Semi-analytic Simulations of Galactic Winds: Volume Filling Factor, Ejection of Metals and Parameter Study, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Semi-analytic Simulations of Galactic Winds: Volume Filling Factor, Ejection of Metals and Parameter Study will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-626975