Absorption Line Selected High Redshift Galaxies

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Scientific paper

We present the preliminary results of a comprehensive survey of a large sample ( ~ 50) of high redshift galaxies (< z > = 0.65) which were selected on the basis of their having produced metal line absorption systems in the spectra of background QSOs. We describe the properties of the galaxies which are, in essence, selected by their H I gas cross-sections, and compare these properties with other high redshift galaxy samples selected using other criteria. In particular, we describe the colors, luminosities, spectral properties, and gas--phase structure of the high redshift galaxies, and show that the population almost certainly represents the progenitors of relatively bright (M_B < -19) normal field galaxies. This population has been largely stable since z ~ 1, and is for the most part distinct from the population of intrinsically faint, very blue galaxies which dominate the faint galaxy surveys selected by apparent magnitude in an optical or infrared observed bandpass. We discuss the implications of our results for the evolution of normal galaxies since z ~ 1.

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