科研之友
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摘要
We report the results of the study of red-sequence (RS) galaxies in 47 galaxy clusters (0.023 < z < 0.047) located in different environments: in the superclusters Hercules and Leo, and in the field, based on the SDSS catalog data. In the interval, the number of bright RS dwarf galaxies in galaxy clusters increaseswith the X-ray luminosity of the cluster as logN ae log (X) (0.64) . The dwarf-to-giant ratio (DGR) does not depend on the surroundings, mass, or richness of the cluster. This ratio is seen to increase for galaxy clusters with log L (X) > 43.5 erg/s or sigma > 520 km/s. The compositeDGR of galaxy clusters, determined both from the membership in different structures and the X-ray luminosity along the radius R (200), is minimum in the central regions of the clusters (about 0.6 +/- 0.06), reaches a maximum within 0.3-0.9R (200) (about 0.9 +/- 0.10), and decreases approximately to 0.7 +/- 0.03 upon reaching the radius 1.4 R-200.
- 出版日期2013-7
