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Date and Time of the Query: 2019-07-17 T01:28:57 PDT
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For refcode 2007ApJ...654L...9F:
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2007ApJ...654L...9F Nonthermal Hard X-Ray Excess in the Coma Cluster: Resolving the Discrepancy between the Results of Different PDS Data Analyses Roberto Fusco-Femiano, Raffaella Landi, and Mauro Orlandini Abstract. The detection of a nonthermal excess in the Coma Cluster spectrum by two BeppoSAX observations analyzed with the XAS package (Fusco-Femiano et al.) has been disavowed by an analysis (Rossetti & Molendi) performed with a different software package (SAXDAS) for the extraction of the spectrum. To resolve this discrepancy we reanalyze the PDS data considering the same software used by Rossetti & Molendi. A correct selection of the data and the exclusion of contaminating sources in the background determination show that the SAXDAS analysis also reports a nonthermal excess with respect to the thermal emission at about the same confidence level of that obtained with the XAS package (~4.8 {sigma}). In addition, we report the lack of the systematic errors investigated by Rossetti & Molendi and Nevalainen et al., taking into account the whole sample of the PDS observations off the Galactic plane, as already shown in our data analysis of Abell 2256 (Fusco-Femiano, Landi, & Orlandini). All this eliminates any ambiguity and confirms the presence of a hard tail in the spectrum of the Coma Cluster. Key words: Cosmology: Cosmic Microwave Background, Galaxies: Clusters: Individual: Name: Coma, Magnetic Fields, Radiation Mechanisms: Nonthermal, X-Rays: Galaxies
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