Published in
Hans Publishers, Astronomy & Astrophysics, 1(492), p. L25-L28
DOI: 10.1051/0004-6361:200810912
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Simultaneous HESS and Chandra observations of Sagitarius A* during an X-ray flare
,
R. A. Bazer-Bachi,
Adnane Robert Bazer-Bachi,
Yvonne Becherini,
Bagmeet Behera,
Wystan Benbow,
Konrad Bernlöhr
and other authors.
Full text: Download
Abstract
The rapidly varying (~10 minute timescale) non-thermal X-ray emission observed from Sgr A* implies that particle acceleration is occuring close to the event horizon of the supermassive black hole. The TeV gamma-ray source HESS J1745-290 is coincident with Sgr A* and may be closely related to its X-ray emission. Simultaneous X-ray and TeV observations are required to elucidate the relationship between these objects. We report on joint H.E.S.S./Chandra observations performed in July 2005, during which an X-ray flare was detected. Despite a factor of 9 increase in the X-ray flux of Sgr A*, no evidence is found for an increase in the TeV gamma-ray flux from this region. We find that an increase in the gamma-ray flux of a factor of 2 or greater can be excluded at a confidence level of 99%. This finding disfavours scenarios in which the keV and TeV emission are associated with the same population of accelerated particles and in which the bulk of the gamma-ray emission is produced within ~10^{14} cm (~100 R_S) of the supermassive black hole. ; Comment: 5 pages, 2 figures