Origin of thermal and non-thermal hard X-ray emission from the galactic center

Vladimir A. Dogiel, Dmitrii O. Chernyshov, Takayuki Yuasa, Dmitrii Prokhorov, Kwong Sang Cheng, Aya Bamba, Hajime Inoue, Chung Ming Ko, Motohide Kokubun, Yoshitomo Maeda, Kazuhisa Mitsuda, Kazuhiro Nakazawa, Noriko Y. Yamasaki

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


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.

Original languageEnglish
Pages (from-to)1099-1105
Number of pages7
JournalPublications of the Astronomical Society of Japan
Issue number5
StatePublished - 2009


  • Galaxy: center
  • ISM: cosmic rays
  • X-rays: diffuse background


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