dc.contributor.author | Aharonian, F. | |
dc.contributor.author | Büsching, I. | |
dc.contributor.author | De Jager, O.C. | |
dc.contributor.author | Holleran, M. | |
dc.contributor.author | Raubenheimer, B.C. | |
dc.contributor.author | Venter, C. | |
dc.contributor.author | H.E.S.S. Collaboration | |
dc.date.accessioned | 2010-01-18T09:30:51Z | |
dc.date.available | 2010-01-18T09:30:51Z | |
dc.date.issued | 2008 | |
dc.identifier.citation | Aharonian, F. et al. 2008. Simultaneous HESS and Chandra observations of Sagitarius A* during an X-ray flare. Astronomy & astrophysics, 492(1):L25-L28. [https://doi.org/10.1051/0004-6361:200810912] | en |
dc.identifier.issn | 0004-6361 | |
dc.identifier.issn | 1432-0746 (Online) | |
dc.identifier.uri | http://hdl.handle.net/10394/2750 | |
dc.identifier.uri | https://doi.org/10.1051/0004-6361:200810912 | |
dc.identifier.uri | http://www.aanda.org/articles/aa/pdf/2008/46/aa10912-08.pdf | |
dc.description.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 | |
dc.language.iso | en | en |
dc.publisher | EDP Sciences | en |
dc.subject | X-rays: individuals: Sgr A* | |
dc.subject | gamma rays: observations | |
dc.title | Simultaneous HESS and Chandra observations of Sagitarius A* during an X-ray flare | en |
dc.type | Article | en |
dc.contributor.researchID | 10859748 - Holleran, Mathew | |
dc.contributor.researchID | 12006653 - Venter, Christo | |
dc.contributor.researchID | 10179240 - Raubenheimer, Barend Christoffel | |
dc.contributor.researchID | 13235176 - Büsching, Ingo | |
dc.contributor.researchID | 10065857 - De Jager, Ocker Cornelis | |