The X-Ray Structure of the Prototype Fossil Group

Details The X-Ray Structure of the Prototype Fossil Group The X-Ray Structure of the Prototype Fossil Group

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop..999j&link_type=abstract

Chandra Proposal ID #03800536

Computer Science

Chandra Proposal Id #03800536

Scientific paper

We discovered the first `fossil' group, which contains a normal, relaxed giant elliptical galaxy but almost no L* galaxies. It appears to be very old, and may represent an end-point of galaxy merging. We propose an ACIS study of the prototype fossil group to (a) study the environment of giant elliptical formation and (b) to understand the unusual properties: a very high X-ray luminosity for the temperature, and a remarkably elongated X-ray surface brightness, indicative of a very anisotropic dark matter distribution. These properties have important implications for the impact of preheating at early epochs and the formation of structures within dark matter filaments. Accompanying proposals are for a sample of high Lx fossil groups (PI Jones), and nearby, low Lx fossil groups (PI Ponman)

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