Simultaneous HESS and Chandra observations of Sagitarius A(star) during an X-ray flare

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dc.contributor.authorAharonian, F.
dc.contributor.authorAkhperjanian, A.
dc.contributor.authorBarres de Almaida, U.
dc.contributor.authorBazer-Bachi, A.
dc.contributor.authorBecherini, Y.
dc.contributor.authorBehera, B.
dc.contributor.authorBenbow, W.
dc.contributor.authorBernlohr, K.
dc.contributor.authorBoisson, C.
dc.contributor.authorBochow, A.
dc.contributor.authorBorrel, V.
dc.contributor.authorBraun, I.
dc.contributor.authorBrion, E.
dc.contributor.authorBrucker, J.
dc.contributor.authorBrun, P.
dc.contributor.authorBuhler, R.
dc.contributor.authorBulik, T.
dc.contributor.authorBusching, I.
dc.contributor.authorBoutelier, T.
dc.contributor.authorCarrigan, S.
dc.contributor.authoret al.
dc.date.issued2008
dc.descriptionCopyright © ESO 2008
dc.description.abstractThe 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 RS) of the supermassive black hole.
dc.description.statementofresponsibilityF. Aharonian, A. G. Akhperjanian, U. Barres de Almeida, A. R. Bazer-Bachi, Y. Becherini ... Gavin P. Rowell ... et al.
dc.identifier.citationAstronomy and Astrophysics: a European journal, 2008; 492(1):L25-L28
dc.identifier.doi10.1051/0004-6361:200810912
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.orcidRowell, G. [0000-0002-9516-1581]
dc.identifier.urihttp://hdl.handle.net/2440/50810
dc.language.isoen
dc.publisherEDP Sciences
dc.rightsCopyright © ESO 2008
dc.source.urihttps://doi.org/10.1051/0004-6361:200810912
dc.subjectgamma rays: observations
dc.subjectX-rays: individuals: Sgr A*
dc.titleSimultaneous HESS and Chandra observations of Sagitarius A(star) during an X-ray flare
dc.typeJournal article
pubs.publication-statusPublished

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