An X-ray review of MS 1054–0321: Hot or not?

XMM-Newton observations are presented for the z = 0.83 cluster of galaxies MS 1054−0321, the highest redshift cluster in the Einstein Extended Medium Sensitivity Survey (EMSS). The temperature inferred by the XMM-Newton data, T = 7.2 +0.7 −0.6 keV, is much lower than the temperature previously reported from ASCA data, T = 12.3

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