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We present results of X-ray observations of the Coma cluster with multipleinstruments over a broad energy band. Using the data from INTEGRAL, RXTE andROSAT observatories, we find that the Coma spectrum in the 0.5-107 keV energyband can be well approximated by a thermal plasma emission model with atemperature of T=8.2 keV. INTEGRAL was used to image the cluster emission inthe hard energy band. The cluster is only marginally detectable ~1.6sigma inthe 44-107 keV energy band; however, the raw flux in this band is consistentwith the previous results from Beppo-SAX and RXTE observatories. We can excludewith high significance that the hard-band flux reported by Beppo-SAX and RXTEcould be produced by a single point source. The 20-80 keV flux of a possiblenon-thermal component in the cluster spectrum is (6.0+-8.8)*10**-12ergs/cm^2/s. It is unlikely that the IC scattering of CMB photons is able toproduce hard X-ray flux at these levels, unless the magnetic field strength isas low as 0.2muG. The latter value can be considered as a lower limit on thefield strength in Coma. We also present a temperature map of the central partof the cluster, which shows significant variations and in particular, a hot,~11.5 keV, region in the extension towards the subcluster infalling from theSouth-West.

X-ray observations of the Coma Cluster in a broad energy band with INTEGRAL, RXTE, and ROSAT observatories