X-ray observations of optically selected giant elliptical-dominated galaxy groups

Alexey Voevodkin, Christopher J. Miller, Konstantin Borozdin, Katrin Heitmann, Salman Habib, Paul Ricker, Robert C. Nichol

Research output: Contribution to journalArticlepeer-review

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 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.

Original languageEnglish (US)
Pages (from-to)204-211
Number of pages8
JournalAstrophysical Journal
Volume684
Issue number1
DOIs
StatePublished - Sep 1 2008

Keywords

  • Galaxies: general
  • X-rays: galaxies

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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