The Redshift Distribution and Luminosity Functions of Galaxies in the Hubble Deep Field
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Abstract
Photometric redshifts have been determined for the galaxies in the Hubble Deep Field. The resulting redshift distribution shows two peaks: one at z ¸ :5 and one at z ¸ 2:5. Luminosity functions derived from the redshifts show strong luminosity evolution as a function of redshift. This evolution is consistent with the Babul & Rees (1992) scenario wherein massive galaxies form stars at high redshift while star formation in dwarf galaxies is delayed until after z = 1. Subject headings: galaxies: distances and redshifts --- galaxies: formation --- galaxies: photometry 1. Introduction The Hubble Deep Field 1 (HDF) optical images are the deepest yet obtained (Williams et al., 1996) . Objects as faint as I ST =28.5 2 can be detected at the 10oe level. At this point in time, no spectroscopic redshifts have been measured for the faintest galaxies in these images. Photometric redshifts (see, for example, Gwyn, 1995; Connolly et al.,1995; Koo, 1985) can be measured much faster and to much f...