Galaxy population in distant galaxy clusters. I. CL 0939+472 (z=0.41) and CL 0016+161 (z=0.54).

Details Galaxy population in distant galaxy clusters. I. CL 0939+472 (z=0.41) and CL 0016+161 (z=0.54). Galaxy population in distant galaxy clusters. I. CL 0939+472 (z=0.41) and CL 0016+161 (z=0.54).

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..118...65b&link_type=abstract

Astronomy and Astrophysics Supplement, v.118, p.65-87

Astronomy and Astrophysics

Astrophysics

17

Galaxies: Clusters: Cl 0939+472, Cl 0016+161, Galaxies: Clusters, Redshifts, Evolution

Scientific paper

We present results of a study of the galaxy population of Cl 0939+472 (z=0.41) and Cl 0016+161 (z=0.54). We have used narrow-band filters (FWHM=~90-200A) and broad band B, R, I filters covering the range from 3800A to 9200A obtain low resolution spectra for all galaxies brighter than R=22.5mag in a 5'x5' (Cl 0939+472) and a 3.5'x5' (Cl 0016+161) field. Template spectra for classical Hubble type and E+A galaxies were fitted to the low-resolution spectral energy distribution in order to determine the galaxies' redshift and the morphological type. We detected 160 cluster members in Cl 0939+472 and 100 in Cl 0016+161, with a success rate of about 80% in the determination of redshifts and corresponding classification of morphological types from spectral energy distributions. These results constitute a statistical improvement of at least a factor of 4 over the most complete study to date of these clusters. In particular, we provide a large sample of elliptical galaxies with secure membership, well suited for a study of evolutionary effects. The same E+A templates developed for the analysis of Cl 0939+472 were successful in recognizing almost all of the spectroscopically already known E+A galaxies in Cl 0016+161 and in identifying 10 new ones. Our results show that in this cluster, too, the fraction of E+A galaxies represents about 20% of the total galaxy population. This outlines the importance of taking into account galaxies with signs of recent star formation for a correct evaluation of the Butcher-Oemler effect in distant galaxy clusters.

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