Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...333..399k&link_type=abstract
Astronomy and Astrophysics, v.333, p.399-410 (1998)
Astronomy and Astrophysics
Astrophysics
12
Galaxies: Formation, Cooling Flows, Hydrodynamics, Methods: Numerical
Scientific paper
We present hydrodynamical simulations of the formation of galaxies in the mass range 10(9) - 10(13) Msun, with the focus on the efficiency of gas cooling. The effect of a background UV radiation field, and the effect of metal enrichment of halo gas due to star formation and stellar evolution, are investigated. A background radiation field is found to strongly suppress the formation of galaxies with circular velocities less than ~ 50 km/s. The effect is, however, not large enough to reconcile hierarchical clustering models with observations. Metal enrichment of the halo gas increases the cooling rate at low redshifts. We find that the mass fraction of gas at virial temperatures may be reduced by a factor of two, in simulations with a UV background field added. The decrease in overall efficiency of gas cooling due to the inclusion of a UV background field can be more than compensated for by the increased cooling that follows metal enrichment of halo gas, but the effect may depend strongly on the assumed model of metal enrichment.
Hultman John
Kallander Daniel
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