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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


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
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