Field Galaxy Evolution Since Z~1 from a Sample of QSO Absorption-Selected Galaxies

Abstract

We present some of the results of a large survey aimed at establishing the properties of galaxies selected by their having produced detectable Mg~II $\lambda \lambda 2796$, 2803 absorption in the spectra of background QSOs. The present sample covers the redshift range $0.2\le z\le 1.0$, with $⟨z⟩=0.65$. From an extensive program of optical and near-IR imaging and optical spectroscopy, we find that the galaxies appear to be similar to normal galaxies at the present epoch, ranging from late--type spiral galaxies to those whose spectra and colors resemble present--day ellipticals. Contrary to some faint field galaxy samples selected using different criteria, over the redshift range observed we find no evidence for significant evolution in rest--frame $B-K$ color, space density, or (rest--frame $B$ or $K$) luminosity. The ``average'' Mg~II absorbing galaxy appears to be consistent with a normal 0.7$L_B^{\ast }$ Sb galaxy having a roughly constant star formation rate since $z\sim 1$, although galaxies spanning a range of a factor of $\sim 70$ in luminosity are found in the absorber sample. The diffuse gas cross-section selection imposed by studies of this kind appears to be biased {\it against} the relatively underluminous, blue galaxies which apparently dominate the number counts at faint magnitudes. However, essentially all ``normal'' field galaxies, independent of spectroscopic type, appear to be potential QSO absorbers.

to appear in ApJ Letters, 6 pages, compressed, uuencoded postscript, CSR-94-22

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