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Date and Time of the Query: 2019-07-24 T02:49:25 PDT
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For refcode 1988ApJ...329...82H:
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1988ApJ...329...82H MEASUREMENTS OF THE GAS TEMPERATURE AND IRON ABUNDANCE DISTRIBUTION IN THE COMA CLUSTER JOHN P. HUGHES, P. GORENSTEIN, AND D. FABRICANT Harvard-Smithsonian Center for Astrophysics Received 1987 September 8; accepted 1987 November 11 ABSTRACT The medium energy X-ray detectors onboard the EXOSAT Observatory have been used to determine the gas temperature at several positions in the Coma Cluster of galaxies. We find evidence at greater than 95% confidence for a higher temperature in the center of the cluster than in a position approximately 45' off-center. No difference in iron abundance is observed between the center and off-center regions and the equilibrium model for the distribution of elements in the Coma Cluster of Abramopoulos, Chanan, and Ku can be rejected with greater than 99.5% confidence, in favor of a model with more uniform composition. We offer a phenomenological model of the Coma Cluster, which is consistent with the data presented here, as well as the imaging data from the Einstein Observatory and the Tenma X-ray spectrum. The model has a central isothermal region of temperature ~9 keV extending to ~25' (~1 Mpc). Beyond this radius the temperature falls as a polytrope with index ~1.6. Subject headings: galaxies: clustering - galaxies: intergalactic medium - X-rays: sources
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