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We have constructed a morphologically divided redshift distribution of faintfield galaxies using a statistically unbiased sample of 196 galaxies brighterthan I = 21.5 for which detailed morphological information (from the HubbleSpace Telescope) as well as ground-based spectroscopic redshifts are available.Galaxies are classified into 3 rough morphological types according to theirvisual appearance (E/S0s, Spirals, Sdm/dE/Irr/Pec's), and redshiftdistributions are constructed for each type. The most striking feature is theabundance of low to moderate redshift Sdm/dE/Irr/Pec's at I < 19.5. Thisconfirms that the faint end slope of the luminosity function (LF) is steep(alpha < -1.4) for these objects. We also find that Sdm/dE/Irr/Pec's are fairlyabundant at moderate redshifts, and this can be explained by strong luminosityevolution. However, the normalization factor (or the number density) of the LFof Sdm/dE/Irr/Pec's is not much higher than that of the local LF ofSdm/dE/Irr/Pec's. Furthermore, as we go to fainter magnitudes, the abundance ofmoderate to high redshift Irr/Pec's increases considerably. This cannot beexplained by strong luminosity evolution of the dwarf galaxy populations alone:these Irr/Pec's are probably the progenitors of present day ellipticals andspiral galaxies which are undergoing rapid star formation or merging with theirneighbors. On the other hand, the redshift distributions of E/S0s and spiralsare fairly consistent those expected from passive luminosity evolution, and areonly in slight disagreement with the non-evolving model.Comment: 11 pages, 4 figures (published in ApJ

The Morphologically Divided Redshift Distribution of Faint Galaxies