Galaxy Number Counts in a Hierarchical Galaxy Formation Model

Mathematics – Logic

Scientific paper

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Scientific paper

Recent results by using a semi-analytic model of galaxy formation based on the hierarchical clustering scenario are presented. Especially we focus on number counts of galaxies. Our model includes selection effects arising from the cosmological dimming of surface brightness of high-redshift galaxies, and also from the absorption of visible light by internal dust and intergalactic HI clouds. We have determined the astrophysical parameters in the model that reproduce observations of nearby galaxies, and used them to predict the number counts and redshifts of faint galaxies for three cosmological models for (1) the standard cold dark matter (CDM) universe, (2) a low-density flat universe (Lambda-CDM), and (3) a low-density open universe (Open-CDM). Contrary to previous analyses by using semi-analytic models which do not take into account such selection effects, we find, from comparison with observed counts and redshifts of faint galaxies in the Hubble Deep Field (HDF), that the standard CDM universe is not preferred, and a low-density universe either with or without cosmological constant is favorable, as suggested by other recent studies.

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