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

Details X-ray Observations of Optically Selected Giant Elliptical-Dominated Galaxy Groups X-ray Observations of Optically Selected Giant Elliptical-Dominated Galaxy Groups

2008-03-26

arxiv.org/abs/0803.3786v2

Astrophys.J.684:204-211,2008

Astronomy and Astrophysics

Astrophysics

8 pages, 6 figures, Accepted for publication in ApJ

Scientific paper

10.1086/590145

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 based on their large velocity dispersions and their proximity to a nearby ROSAT X-ray source. Additionally, 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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