A Test for Formation Models of Fossil Groups of Galaxies

Details A Test for Formation Models of Fossil Groups of Galaxies A Test for Formation Models of Fossil Groups of Galaxies

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.3401d&link_type=abstract

American Astronomical Society Meeting 210, #34.01; Bulletin of the American Astronomical Society, Vol. 39, p.147

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Scientific paper

Fossil groups are galaxy systems that present an unusual lack of bright galaxies in the inner regions, except for a giant central E galaxy. Recent measurements of galaxy velocity dispersion and gas temperatures show that they have cluster-size masses. The standard explanation for their formation suggests that the bright galaxies were wiped out by galactic cannibalism in the inner regions. If so, strong galactic winds resulting from galaxy merging would be trapped by their deep potential wells destroying the central enhancement of SN Ia/SN II ejecta ratio typically seen in other galaxy groups. This can be tested by looking at the distribution of abundance ratios near the core. We present some preliminary results of this analysis using archival data for the few best-observed targets.

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