XMM-Newton Proposal 02050702

Physics

Scientific paper

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Abell 576, Abell 576, Xmm-Newton Proposal 02050702

Scientific paper

We have recently found significant bulk velocities on the order of >2000 km/s in the ICM of Abell 576, as a result of a systematic search for ICM bulk motions in the ASCA archive. Such high gas velocities have a profound impact on our understanding of formation and evolution of clusters as well as in determining fundamental physical characteristics such as ICM mass and energetics. Therefore, independent confirmation of this discovery is crucial. XMM provides a unique opportunity to corroborate and improve such measurements due to the excellent gain stability of EPIC-MOS, which allows us to tailor the observation specifically for velocity studies. This will provide an enormous improvement over previous satellites allowing us to measure gas velocity differences of ~ 400km/s.

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