X-ray Observations of Optically Selected Giant Elliptical-Dominated Galaxy Groups
Astrophysics
2009-11-13 v2
Abstract
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.
Cite
@article{arxiv.0803.3786,
title = {X-ray Observations of Optically Selected Giant Elliptical-Dominated Galaxy Groups},
author = {Alexey Voevodkin and Christopher J. Miller and Konstantin Borozdin and Katrin Heitmann and Salman Habib and Paul Ricker and Robert C. Nichol},
journal= {arXiv preprint arXiv:0803.3786},
year = {2009}
}
Comments
8 pages, 6 figures, Accepted for publication in ApJ