Physics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop..196d&link_type=abstract
XMM-Newton Proposal ID #06746701
Physics
Groups Of Galaxies, Clusters Of Galaxies, Supercluster, A545
Scientific paper
Detailed studies of A545 at radio, optical and X-ray wavelengths point to a system undergoing a major merger. The unique discovery of an extended stellar halo resembling that of a cD but with no associated BCG is particularly intriguing as it suggests this system may be undergoing a critical dynamic phase that is rarely observed. The available XMM data while hinting to a number of interesting features, most notably a shock ~400 kpc North of the surface brightness peak, are of limited use because of the extreme contamination by soft protons. We propose a 50 ks observation of A545 to constrain the phase and geometry of the merger. The combination of the proposed X-ray observation with the available optical and radio data will allow us to construct a global picture of the dynamical status of A545.
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