Abstract
We interpret galaxy counts in the B and K bands, and the redshift distribution of faint galaxies, using a model for galaxy formation in a hierarchical universe. We first study how variation of each of the free parameters in our model affects its observational predictions. These parameters control processes such as star formation, supernova feedback and merging, and determine the masses and luminosities of the galaxies that populate the evolving distribution of dark matter haloes. We find that more efficient merging results in a galaxy luminosity function with a lower amplitude at the faint end at all epochs. This causes the slope of the faint counts to decrease, and the redshift distribution to shift to higher values of z
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