Journal Article

A past capture event at Sagittarius A* inferred from the fluorescent X-ray emission of Sagittarius B clouds

Yun-Wei Yu, K. S. Cheng, D. O. Chernyshov and V. A. Dogiel

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 3, pages 2002-2008
Published in print March 2011 | ISSN: 0035-8711
Published online February 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17826.x
A past capture event at Sagittarius A* inferred from the fluorescent X-ray emission of Sagittarius B clouds

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The fluorescent X-ray emission from neutral iron in the molecular clouds [Sagittarius (Sgr) B] indicates that the clouds are being irradiated by an external X-ray source. The source is probably associated with the Galactic central black hole (Sgr A*), which triggered a bright outburst 100 yr ago. We suggest that such an outburst could be due to a partial capture of a star by Sgr A*, during which a jet was generated. Using constraints from the observed flux and the time variability (∼10 yr) of the Sgr B fluorescent emission, we find that the shock produced by the interaction of the jet with the dense interstellar medium represents a plausible candidate for the X-ray source emission.

Keywords: black hole physics; radiation mechanisms: non-thermal; Galaxy: centre; X-rays: individual: Sagittarius B

Journal Article.  5099 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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