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Origin of Thermal and Non-Thermal Hard X-ray Emission from the Galactic Center

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arxiv 0906.2247 v1 pith:2AOQG2VO submitted 2009-06-12 astro-ph.GA astro-ph.HE

Vladimir Dogiel , Dmitrii Chernyshov , Takayuki Yuasa , Dmitrii Prokhorov , Kwong-Sang Cheng , Aya Bamba , Hajime Inoue , Chung-Ming Ko
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Motohide Kokubun Yoshitomo Maeda Kazuhisa Mitsuda Kazuhiro Nakazawa Noriko Y.Yamasaki
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classification astro-ph.GAastro-ph.HE
keywords emissionfluxx-raycentergalacticgeneratedhardnon-thermal
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abstract

We analyse new results of Chandra and Suzaku which found a flux of hard X-ray emission from the compact region around Sgr A$^\ast$ (r ~ 100 pc). We suppose that this emission is generated by accretion processes onto the central supermassive blackhole when an unbounded part of captured stars obtains an additional momentum. As a result a flux of subrelativistic protons is generated near the Galactic center which heats the background plasma up to temperatures about 6-10 keV and produces by inverse bremsstrahlung a flux of non-thermal X-ray emission in the energy range above 10 keV.

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