Other
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714927i&link_type=abstract
American Astronomical Society, AAS Meeting #217, #149.27; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
Fossil groups present a puzzle to current theories of structure formation. Despite the low number of bright galaxies, their high velocity dispersions and high gas temperatures seem to indicate cluster-like gravitational potentials. One extreme example of a potential fossil group is the Cheshire Cat gravitational lens group of galaxies. While it contains two bright central galaxies rather than one (surrounded by 25 galaxies at least two magnitudes fainter), these galaxies are moving at least 1100 km/s relative to one another and likely represent the collision of TWO fossil groups. We analyzed data from a moderately long Chandra observation of the Cheshire Cat and found and found the ICM to have a very hot ( 6 keV) core, but a low X-ray luminosity, which places it off the LX/TX relation for groups/clusters. Furthermore, the X-ray emission does not appear to be centered on either bright galaxy, but midway between them. We discuss the implications of the Chandra results and discuss whether this system represents the first example of a fossil-group/fossil group merger.
Dupke Renato
Irwin Jimmy
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