Hard X-ray view of the past activity of Sgr A in a natural Compton mirror

@article{Revnivtsev2004HardXV,
  title={Hard X-ray view of the past activity of Sgr A in a natural Compton mirror},
  author={Mikhail G. Revnivtsev and Eugene Churazov and Sergei Y. Sazonov and Rashid Sunyaev and Alexander A. Lutovinov and Marat Gilfanov and Alexey Vikhlinin and P. E. Shtykovsky and Masayuki Iki and Moscow and Russia. and -- Mpa and Garching and H Germany and - CfA and Cambridge and Usa},
  journal={Astronomy and Astrophysics},
  year={2004},
  volume={425}
}
We report the association of the recently discovered hard X-ray source IGR J17475−2822 with the giant molecular cloud Sgr B2 in the Galactic Center region. The broad band (3-200 keV) spectrum of the source constructed from data of different observatories strongly supports the idea that the X-ray emission of Sgr B2 is Compton scattered and reprocessed radiation emitted in the past by the Sgr Asource. We conclude that 300-400 years ago Sgr Awas a low luminosity (L ≈ 1.5 × 10 39 erg s −1 at 2-200… 

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