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dc.contributor.authorAharonian, F.
dc.contributor.authorBüsching, I.
dc.contributor.authorDe Jager, O.C.
dc.contributor.authorHolleran, M.
dc.contributor.authorRaubenheimer, B.C.
dc.contributor.authorVenter, C.
dc.date.accessioned2010-01-18T09:30:51Z
dc.date.available2010-01-18T09:30:51Z
dc.date.issued2008
dc.identifier.citationAharonian, F. et al. 2008. Simultaneous HESS and Chandra observations of Sagitarius A* during an X-ray flare. Astronomy & astrophysics, 492(1):L25-L28. [http://www.aanda.org/]en
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/2750
dc.identifier.urihttps://doi.org/10.1051/0004-6361:200810912
dc.identifier.urihttp://www.aanda.org/articles/aa/pdf/2008/46/aa10912-08.pdf
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) of the supermassive black hole
dc.language.isoenen
dc.publisherEDP Sciencesen
dc.subjectX-rays: individuals: Sgr A*
dc.subjectgamma rays: observations
dc.titleSimultaneous HESS and Chandra observations of Sagitarius A* during an X-ray flareen
dc.typeArticleen
dc.contributor.researchID10859748 - Holleran, Mathew
dc.contributor.researchID12006653 - Venter, Christo
dc.contributor.researchID10179240 - Raubenheimer, Barend Christoffel
dc.contributor.researchID13235176 - Büsching, Ingo
dc.contributor.researchID10065857 - De Jager, Ocker Cornelis


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