Mathematics – Logic
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop..160s&link_type=abstract
XMM-Newton Proposal ID #05552204
Mathematics
Logic
Groups Of Galaxies, Clusters Of Galaxies, Supercluster, Abell 2401, Abell 2955, Abell S0296, Abell 3920, Xmm-Newton Proposal Id #05552204
Scientific paper
The baryon fraction (f_b) in collapsed massive halos has great cosmological significance, and comprises hot gas and stars --- both in galaxies and the intracluster light (ICL). While the gas mass is known to be depleted in groups, it is not clear if the missing baryons have been ejected from the halo or are simply locked up in stars. The best current study suggests an increasing ICL fraction in groups offsets a declining gas fraction, implying a universal f_b, but this is based on only 2 low mass groups, with only estimated stellar baryon masses. We propose to observe the only 4 poor groups for which a state-of-the-art measurement of intragroup stellar baryons has been made, to map the hot gas and thereby discriminate definitively between these two scenarios.
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