Hard X-ray Radiation in the Coma Cluster

Details Hard X-ray Radiation in the Coma Cluster Hard X-ray Radiation in the Coma Cluster

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.513f&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

Hard X-ray radiation has been detected for the first time in the Coma cluster spectrum, during the AO-1 observations. Thanks to the unprecedented sensitivity of the Phoswich Detection System (PDS) onboard the Beppo-SAX observatory, the source has been detected up to ~80 keV. There is clear evidence for non-thermal emission in excess to the thermal one above ~25 keV at a 4.5 sigma level. Our analysis is able to exclude that the hard excess may be due to X Comae, a type I Seyfert galaxy present in the FOV of the PDS. A volume-averaged intracluster magnetic field of 0.16 mu G is derived, in order to account for the observed syncrotron radio emission. This value is in contrast with the estimates based on Faraday rotation measurements seen through the hot intracluster medium of the Coma Cluster.

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