Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-03-22
AIPConf.Proc.990:418-422,2008
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures, class file included, accepted by ApJ Letters, minor changes and expanded Figure 3
Scientific paper
10.1063/1.2905652
We show that radiative feedback due to reionization has a pronounced effect on the extent of mechanical feedback due to galactic outflows. The photoionization of the Intergalactic Medium (IGM) suppresses low-mass galaxy formation by photoheating the gas and limiting atomic line cooling. The number of low-mass galaxies is central for the enrichment of the IGM as these objects have the capacity to enrich a significant fraction (by volume) of the Universe. We use a modified version of our galactic outflow model, combined with a simple criterion for suppression, to investigate the potential impact upon the IGM. We find that this suppression strongly reduces the enrichment of the IGM and is sensitive to the reionization history. We also investigate the contribution of halos of different masses with varying degrees of suppression.
Martel Hugo
Pieri Matthew M.
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