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

M.G. Revnivtsev(1,2), E.M. Churazov(1,2), S.Yu. Sazonov(1,2), R.A. Sunyaev(1,2), A.A. Lutovinov(1),, M.R. Gilfanov(1,2), A.A. Vikhlinin(1,3), P.E. Shtykovsky(1) and M.N. Pavlinsky(1)

(1) Space Research Institute, Russian Academy of Sciences, Profsoyuznaya 84/32, 117997 Moscow, Russia & Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D-85740 Garching bei München, Germany & Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA

Paper: A&A 2004, in press

Weblink: http://integral.rssi.ru/~mikej/sgr_aa.ps.gz

EPrint Server: astro-ph/0408190


We report the association of the recently discovered hard X-ray source \igr with the giant molecular cloud \sgrb 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 \sgrb is Compton scattered and reprocessed radiation emitted in the past by the \sgra source. We conclude that 300-400 years ago \sgra was a low luminosity (L 1.5* 1039 erg s-1 at 2-200 keV) AGN with a characteristic hard X-ray spectrum (photon index \Gamma 1.8). We estimate the mass and iron abundance of the \sgrb scattering gas at 2* 106Mo(r/10 pc)2 and 1.9 solar, respectively (where r is the radius of the cloud).

Preprints available from the authors at mikej@mpa-garching.mpg.de , or the raw TeX (no figures) if you click here.

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