Are fossil groups a challenge of the CDM paradigm?

Details Are fossil groups a challenge of the CDM paradigm? Are fossil groups a challenge of the CDM paradigm?

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006xmm..prop...36p&link_type=abstract

XMM-Newton Proposal ID #05011102

Computer Science

Groups Of Galaxies, Clusters Of Galaxies, Supercluster, Rxcj2315.7-0222, Rxcj0216.7-4749, Xmm-Newton Proposal 05011102

Scientific paper

Fossil groups may have up to two orders of magnitude less substructure than predicted in CDM simulations. The significance of this lack of substructure depends on the depth of the galaxy luminosity function and on the mass of the group. We have initiated a project to determine the substructure distribution function (SDF) for the members of a representative sample of 4 REFLEX fossil groups down to M^* + 6 within a large fraction of the infall region. We will obtain X-ray observations of two fossil groups to complete the X-ray sample, to complement the optical observations and to compare with new simulations. We will compare the SDF from optical and X-ray mass estimates with theoretical predictions. We will establish if fossil groups do challenge the CDM paradigm.

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