Confirmation of Nonthermal Hard X-Ray Excess in the Coma Cluster from Two Epoch Observations

  • Fusco-Femiano R
  • Orlandini M
  • Brunetti G
  • et al.
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Abstract

We report the hard X-ray spectrum of the Coma cluster obtained using the PDS data of two independent BeppoSAX observations performed with a time interval of about three years. In both the spectra a non thermal 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 non-thermal X-ray flux which is slightly lower than that previously estimated (Fusco-Femiano et al. 1999) and in agreement with that measured by two RXTE observations. The analysis of the offset fields in our Coma observations provides a possible flux determination of the BL Lac object 1ES 1255+244.

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Fusco-Femiano, R., Orlandini, M., Brunetti, G., Feretti, L., Giovannini, G., Grandi, P., & Setti, G. (2004). Confirmation of Nonthermal Hard X-Ray Excess in the Coma Cluster from Two Epoch Observations. The Astrophysical Journal, 602(2), L73–L76. https://doi.org/10.1086/382695

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