X-ray And Optical Properties Of The Galaxy Groups RXJ0029-0012 And RXJ1505-0308
Abstract
We present a joint optical-X-ray analysis of two newly discovered over-luminous elliptical galaxies (OLEGs). These massive ellipticals were targeted for XMM 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 OLEGs meets the standard criteria for a fossil group. While the second system has a prominent magnitude gap in the E/S0 ridgeline, it does not appear to have reached the fossil-like final stage of group evolution.
- Publication:
-
American Astronomical Society Meeting Abstracts #211
- Pub Date:
- March 2008
- Bibcode:
- 2008AAS...21115806M