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    Simultaneous HESS and Chandra observations of Sagitarius A* during an X-ray flare

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    A&A-2008-v492-L25.pdf (131.8Kb)
    Date
    2008
    Author
    Aharonian, F.
    Büsching, I.
    De Jager, O.C.
    Holleran, M.
    Raubenheimer, B.C.
    Venter, C.
    H.E.S.S. Collaboration
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    Abstract
    The rapidly varying (~10 min 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 γ-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 HESS/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 γ-ray flux from this region. We find that an increase in the γ-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 γ-ray emission is produced within ~1014 cm (~100) of the supermassive black hole
    URI
    http://hdl.handle.net/10394/2750
    https://doi.org/10.1051/0004-6361:200810912
    http://www.aanda.org/articles/aa/pdf/2008/46/aa10912-08.pdf
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