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

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

2004-08-10

arxiv.org/abs/astro-ph/0408190v1

Astron.Astrophys. 425 (2004) L49-L52

Astronomy and Astrophysics

Astrophysics

5 pages, 3 fugures. Submmitted to A&A Letters. Version with original quality figures can be taken from http://integral.rssi.ru

Scientific paper

10.1051/0004-6361:200400064

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 A* source. We conclude that 300-400 years ago Sgr A* was a low luminosity (L ~ 1.5e39 erg/s 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 Sgr B2 scattering gas at 2e6 Msun (r/10pc)^2 and 1.9 solar, respectively (where r is the radius of the cloud).

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