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Date and Time of the Query: 2019-07-22 T05:53:54 PDT
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For refcode 2008ApJ...687..968L:
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2008ApJ...687..968L X-Ray Observations of the Coma Cluster in a Broad Energy Band with the INTEGRAL, RXTE, and ROSAT Observatories Lutovinov, A. A.; Vikhlinin, A.; Churazov, E. M.; Revnivtsev, M. G.; Sunyaev, R. A. Abstract. We present results of X-ray observations of the Coma Cluster with multiple instruments over a broad energy band. Using the data from the INTEGRAL, RXTE, and ROSAT observatories, we find that the Coma spectrum in the 0.5-107 keV energy band can be well approximated by a thermal plasma emission model with a temperature of T=8.2 keV. INTEGRAL was used to image the cluster emission in the hard energy band. The cluster is only marginally detectable (~1.6 {sigma}) in the 44-107 keV energy band; however, the raw flux in this band is consistent with the previous results from the BeppoSAX and RXTE observatories. We can exclude with high significance that the hard-band flux reported by BeppoSAX and RXTE could be produced by a single point source. The 20-80 keV flux of a possible nonthermal component in the cluster spectrum is (6.0+/-8.8)x10^-12^ ergs cm^-2^ s^-1^. Using the upper limits on nonthermal flux, we obtain a lower limit on magnetic field of 0.1-0.2 muG (depending on the spatial model for a smoothly varying field). We also present a temperature map of the central part of the cluster, which shows significant variations and, in particular, a hot ~11.5 keV region in the extension toward the subcluster infalling from the southwest. Key words: Galaxies: Clusters: General, Galaxies: Clusters: Individual: Name: Coma
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