Thursday, August 16, 2012

1208.2990 (A. Simionescu et al.)

Large-scale Motions in the Perseus Galaxy Cluster    [PDF]

A. Simionescu, N. Werner, O. Urban, S. W. Allen, A. C. Fabian, J. S. Sanders, A. Mantz, P. E. J. Nulsen, Y. Takei
By combining large-scale mosaics of ROSAT PSPC, XMM-Newton, and Suzaku X-ray observations, we present evidence for large-scale motions in the intracluster medium of the nearby, X-ray bright Perseus Cluster. These motions are suggested by several alternating and interleaved X-ray bright, low-temperature, low-entropy arcs located along the east-west axis, at radii ranging from ~10 kpc to over a Mpc. Thermodynamic features qualitatively similar to these have previously been observed in the centers of cool core clusters, and were successfully modeled as a consequence of the gas sloshing/swirling motions induced by minor mergers. Our observations indicate that such sloshing/swirling can extend out to larger radii than previously thought, on scales approaching the virial radius.
View original: http://arxiv.org/abs/1208.2990

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