Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21331306k&link_type=abstract
American Astronomical Society, AAS Meeting #213, #313.06; Bulletin of the American Astronomical Society, Vol. 41, p.291
Mathematics
Logic
Scientific paper
We study the process of galaxy growth via gas accretion from the intergalactic medium in the SPH cosmological simulations. We find that the low mass halos are always dominated by the cold gas, but as halo mass increases the hot halo builds up and it dominates the gas content of massive halos. Interestingly, at high redshift, the gas accretion of all galaxies in our simulations is completely dominated by the cold mode accretion, where the IGM supplies galaxies via cold, dense filamentary flows of gas, providing fuel for star formation. Owing to their high density, filaments can survive in halos dominated with hot gas and still supply galaxies with cold gas. Furthermore, the cooling of the hot halo gas is much less efficient than the simple models would predict owing to density cores that build-up in these halos and drastically suppress the gas cooling. Only at low redshift, at intermediate halo masses, the cooling of the hot atmosphere can be a significant source of gas supply for galaxies. However, owing to the hierarchical growth of massive galaxies and inefficient hot mode accretion in these objects, the cold mode dominates the buildup of galaxies at all masses.
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