Non-uniform Temperature Distribution In The Galaxy Clusters 2a 0335+096 And Abell 496 Observed By Xmm-newton

Details Non-uniform Temperature Distribution In The Galaxy Clusters 2a 0335+096 And Abell 496 Observed By Xmm-newton Non-uniform Temperature Distribution In The Galaxy Clusters 2a 0335+096 And Abell 496 Observed By Xmm-newton

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1368t&link_type=abstract

American Astronomical Society, HEAD meeting #9, #13.68; Bulletin of the American Astronomical Society, Vol. 38, p.1290

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Scientific paper

We present the XMM-Newton results of the galaxy clusters 2A 0335+096 and Abell 496. Chandra observations of both clusters revealed a cold front showing the dynamical motion of a cold core. From an investigation of 2-dimensional ICM profiles, we obtained new features related to dynamical activities in the ICM. In 2A 0335+096, we found a spiral cool tail trailing behind the central cold core. The deprojected temperature of the tail is 1.7 keV, which is consistent with one of the three temperatures obtained for the central core. The spiral feature apparently shows a turnaround motion of the core. We suggest that the cool tail feature represents evidence for turbulent viscous stripping of the remaining subcluster core. For Abell 496, we found another cold front 4' south of the X-ray emission peak. From the pressure profile across the cold front, we derived an upper limit to the Mach number of a gas body of 0.2. As for the temperature distribution in the outer region, we found non-uniformity on the cluster scale for both clusters, which suggests that both clusters experienced a merger in the past. We argue that the gas dynamical motions seen in the central region of both cluster can be attributed to the past merger.

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