X-ray And Optical Properties Of The Galaxy Groups RXJ0029-0012 And RXJ1505-0308

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

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.

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