X-Ray Observations of Optically Selected Giant Elliptical-Dominated Galaxy Groups

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 RO...

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Published inThe Astrophysical journal Vol. 684; no. 1; pp. 204 - 211
Main Authors Voevodkin, Alexey, Miller, Christopher J, Borozdin, Konstantin, Heitmann, Katrin, Habib, Salman, Ricker, Paul, Nichol, Robert C
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.09.2008
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Summary: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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ISSN:0004-637X
1538-4357
DOI:10.1086/590145