Confirmation of non-thermal hard X-ray excess in the Coma cluster from two epoch observations

Details Confirmation of non-thermal hard X-ray excess in the Coma cluster from two epoch observations Confirmation of non-thermal hard X-ray excess in the Coma cluster from two epoch observations

2003-12-26

arxiv.org/abs/astro-ph/0312625v1

Astrophys.J. 602 (2004) L73-L76

Astronomy and Astrophysics

Astrophysics

14 Pages, 1 figure. Accepted for publication on ApJ Letters

Scientific paper

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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