Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004xmm..prop...80k&link_type=abstract
XMM-Newton Proposal ID #03023201
Physics
Groups Of Galaxies, Clusters Of Galaxies, Supercluster, Ngc 7618/Ugc 12, Xmm-Newton Proposal 03023201
Scientific paper
We propose a 30 ks XMM-Newton observation of the merging groups NGC 7618 and UGC 12491. Group-group mergers play an key role in the formation of structure in the Universe, but have been poorly studied relative to galaxy clusters because of their lower X-ray luminosity. These two groups aree nearby (74 Mpc), X-ray bright, and separated by only 280 kpc on the sky. Our goal is to map the thermodynamic parameters of the gas across the merger to constrain the dynamics of the merger. A short Chandra observation of NGC 7618 revealed a sharp surface brightness discontinuity probably related to motion of the group core due to the merger. The NGC 7618/UGC 12491 pair is an ideal example to study the hydrodynamics of the early stage of a merger between two galaxy groups.
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