Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/50810
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Type: | Journal article |
Title: | Simultaneous HESS and Chandra observations of Sagitarius A(star) during an X-ray flare |
Author: | Aharonian, F. Akhperjanian, A. Barres de Almaida, U. Bazer-Bachi, A. Becherini, Y. Behera, B. Benbow, W. Bernlohr, K. Boisson, C. Bochow, A. Borrel, V. Braun, I. Brion, E. Brucker, J. Brun, P. Buhler, R. Bulik, T. Busching, I. Boutelier, T. Carrigan, S. et al. |
Citation: | Astronomy and Astrophysics: a European journal, 2008; 492(1):L25-L28 |
Publisher: | EDP Sciences |
Issue Date: | 2008 |
ISSN: | 0004-6361 1432-0746 |
Statement of Responsibility: | F. Aharonian, A. G. Akhperjanian, U. Barres de Almeida, A. R. Bazer-Bachi, Y. Becherini ... Gavin P. Rowell ... et al. |
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 RS) of the supermassive black hole. |
Keywords: | gamma rays: observations X-rays: individuals: Sgr A* |
Description: | Copyright © ESO 2008 |
Rights: | Copyright © ESO 2008 |
DOI: | 10.1051/0004-6361:200810912 |
Published version: | http://dx.doi.org/10.1051/0004-6361:200810912 |
Appears in Collections: | Aurora harvest Chemistry and Physics publications |
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hdl_50810.pdf | Published version | 101.86 kB | Adobe PDF | View/Open |
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