期刊
ASTROPHYSICAL JOURNAL
卷 684, 期 1, 页码 204-211出版社
UNIV CHICAGO PRESS
DOI: 10.1086/590145
关键词
galaxies : general; galaxies : clusters : individual (RXJ 0029-0012, RXJ 1505+0308, UGC 00842); X-rays : galaxies
资金
- Los Alamos National Laboratory
We present a combined optical and X-ray analysis of three optically selected X-ray-bright groups with giant elliptical galaxies in the center. These massive ellipticals were targeted for XMM-Newton X-ray observations on the basis of their large-velocity dispersions and their proximity to a nearby ROSAT X-ray source. In addition, these targets are significantly brighter in the optical than their nearest neighbors. We show that one of these systems meets the standard criteria for a fossil group. While the other two systems have a prominent magnitude gap in the E/S0 ridgeline, they do not appear to have reached the fossil-like final stage of group evolution.
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