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The Effects of Starbursts and Low-Surface-Brightness Galaxies on Faint Galaxy Models

By B. A. Mcleod and M. J. Rieke

Abstract

We present models predicting the magnitude, redshift, and color distributions of field galaxies. We explore whether a fading starburst scenario can account for the observations of faint blue galaxies. We marginally rule out a starburst scenario with a local IMF because the models predict too many nearby faint galaxies that are not observed. A burst model with a truncated IMF reproduces the counts and redshift distributions well but produces too blue a population. We show that surface brightness selection has a significant effect on the distributions. In particular, adding a population of low-surface brightness galaxies, known to exist locally, can explain the counts for BJ < 23. They do not, however, account for the steepness of the counts at fainter magnitudes. Finally we show that the colors of galaxies in a K-band selected sample are too blue to be consistent with a constant star-formation rate, passive-evolution model. 1

Year: 1995
OAI identifier: oai:CiteSeerX.psu:10.1.1.316.2940
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