Published online by Cambridge University Press: 03 August 2017
The properties of the MgII absorption line systems detected in quasar spectra are briefly summarized. If these absorption systems arise in intervening galaxies, one can estimate their characteristic size and luminosity, and predict their identification rate. Results of a search for the absorbers is presented for a sample of 13 MgII systems at 0.16 ≤ z ≤ 0.79. Strong constraints on the luminosity function are derived from the high actual identification rate and observed galaxy luminosities. Other properties of these absorbing galaxies are discussed, especially their spectral type and spatial environment.