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Date and Time of the Query: 2019-07-16 T07:24:22 PDT
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For refcode 2004ApJ...602L..73F:
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Copyright by American Astronomical Society. Reproduced by permission
2004ApJ...602L..73F Confirmation of Nonthermal Hard X-Ray Excess in the Coma Cluster from Two Epoch Observations Roberto Fusco-Femiano, Mauro Orlandini, Gianfranco Brunetti, Luigina Feretti, Gabriele Giovannini, Paola Grandi, and Giancarlo Setti Abstract. We report the hard X-ray spectrum of the Coma Cluster obtained using the Phoswich Detection System data of two independent BeppoSAX observations performed with a time interval of about 3 yr. In both the spectra a nonthermal excess with respect to the thermal emission is present at a confidence level of ~3.4 {sigma}. The combined spectrum obtained by adding up the two spectra allows a measurement of the excess at the level of ~4.8 {sigma} at energies above 20 keV. The analysis of the full BeppoSAX data set provides a revised nonthermal X-ray flux that is slightly lower than that previously estimated (Fusco-Femiano et al.) and in agreement with that measured by two Rossi X-Ray Timing Explorer observations. The analysis of the offset fields in our Coma observations provides a possible flux determination of the BL Lac object 1ES 1255+244. Keywords: Galaxies: BL Lacertae Objects: Individual: 1ES 1255+244, Cosmology: Cosmic Microwave Background, Galaxies: Clusters: Individual: Coma, Magnetic Fields, Radiation Mechanisms: Nonthermal, X-Rays: Galaxies
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