Simultaneous H.E.S.S. and Chandra observations of Sgr A* during an X-ray flare

Details Simultaneous H.E.S.S. and Chandra observations of Sgr A* during an X-ray flare Simultaneous H.E.S.S. and Chandra observations of Sgr A* during an X-ray flare

2007-10-08

arxiv.org/abs/0710.1537v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, Contribution to the 30th ICRC, Merida, Mexico, July 2007

Scientific paper

The rapidly varying non-thermal X-ray emission observed from Sgr A* points to particle acceleration taking place close to the supermassive black hole. The TeV gamma-ray source HESS J1745-290 is coincident with Sgr A* and may be closely related to the X-ray emission. Simultaneous X-ray and TeV observations are required to elucidate the relationship between these two objects. Here we report on joint H.E.S.S./Chandra observations in July 2005, during which an X-ray flare was detected. Despite a factor >10 increase in the X-ray flux of Sgr A*, no evidence is found for an increase in the TeV gamma-ray flux. We find that an increase of the gamma-ray flux of a factor 2 or greater can be excluded at a confidence level of 99%. This finding disfavours scenarios in which the bulk of the gamma-ray emission observed is produced close to Sgr A*.

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