Origin of Thermal and Non-Thermal Hard X-Ray Emission from the Galactic Center
Maeda, Yoshitomo; Kokubun, Motohide; Nakazawa, Kazuhiro; Mitsuda, Kazuhisa; Yamasaki, Noriko Y.; Bamba, Aya; Inoue, Hajime; Yuasa, Takayuki; Dogiel, Vladimir A.; Chernyshov, Dmitrii O.; Prokhorov, Dmitrii; Cheng, Kwong-Sang; Ko, Chung-Ming
Japan, Russia, France, Hong Kong SAR, Taiwan
Abstract
We analyse new results of Chandra and Suzaku Observatories which found a flux of hard X-ray emission from the compact region around Sgr A* (r ∼ 100 pc). We suppose that this emission is generated by accretion processes onto the central supermassive blackhole when an unbound 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.