Physics
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop..126m&link_type=abstract
XMM-Newton Proposal ID #04031603
Physics
Groups Of Galaxies, Clusters Of Galaxies, Supercluster, J002937.0-00121, J150548.7+03084, J015358.7-09434, Xmm-Newton Proposal 04031603
Scientific paper
We will observe 3 candidate fossil groups identified using SDSS and RASS. The dozen previously known fossil groups show normal X-ray group properties, but have optical properties that are dominated by a bright central galaxy. The formation of such systems is not understood, although various mechanisms have been suggested. We will measure the luminosities, surface brightnesses, and radial temperature profiles and correlate with the optical data. Some of these systems show an excess X-ray luminosity (with respect to their temperatures or optical properties) which could be explained by cooling, entropy, or inefficient star-formation. By combining with N-body/Hydro simulations, we will learn about their abundances and formation mechanisms.
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