Galaxy evolution in distant, X-ray-selected clusters of galaxies. I - CL 1358 + 6245

Details Galaxy evolution in distant, X-ray-selected clusters of galaxies. I - CL 1358 + 6245 Galaxy evolution in distant, X-ray-selected clusters of galaxies. I - CL 1358 + 6245

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381...33f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 1, 1991, p. 33-54.

Astronomy and Astrophysics

Astronomy

90

Galactic Clusters, Galactic Evolution, X Ray Sources, Astronomical Photometry, Sky Surveys (Astronomy)

Scientific paper

A photometric and spectroscopic survey of a cluster of galaxies at z = 0.327 is presented in order. V, R, and I photometry of 288 stars and galaxies was obtained in a region 5.7 x 6.5 arcmin which is approximately centered on the dominant galaxy at the cluster center. Evidence is found for evolution of the galaxy population as compared with clusters at the present epoch. Approximately 17 percent of the cluster members have 'E + A' spectra, with strong Balmer absorption lines, the normal absorption features of E/SO galaxies, and no emission lines. In comparable nearby clusters, on the other hand, only about 1 percent of the galaxies have E + A spectra. Approximately 10 percent of the cluster members have emission-line spectra compared with about 5 percent in present epoch clusters. The total 'active' population, defined as the sum of the E + A and emission-line populations, represents about 27 percent of the population in the cluster core. These results are consistent with the size of the active population found in optically selected samples of distant clusters at similar redshifts.

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