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Title: Simultaneous HESS and Chandra observations of Sagitarius A(star) during an X-ray flare
Authors: Aharonian, F.
Akhperjanian, A. G.
de Almeida UB
Bazer-Bachi, A. R.
Becherini, Y.
Behera, B.
Benbow, W.
Bernloehr, K.
Boisson, C.
Bochow, A.
Borrel, V.
Fontaine, G.
Tavernet, J. -. P.
Terrier, R.
Tibolla, O.
van Eldik C
Vasileiadis, G.
Venter, C.
Vialle, J. P.
Vincent, P.
Chounet, L. -. M.
Orford, K. J.
Vivier, M.
Voelk, H. J.
Fuessling, M.
Buehler, R.
Volpe, F.
Wagner, S. J.
Ward, M.
Zdziarski, A. A.
Zech, A.
Bulik, T.
Hauser, D.
Clapson, A. C.
Buesching, I.
Boutelier, T.
Carrigan, S.
Gabici, S.
Chadwick, P. M.
Coignet, G.
Dalton, M.
Degrange, B.
Deil, C.
Hauser, M.
Gallant, Y. A.
Keogh, D.
Dickinson, H. J.
Djannati-Atai, A.
Domainko, W.
Drury, L. O.
Dubois, F.
Dubus, G.
Dyks, J.
Dyrda, M.
Heinz, S.
Egberts, K.
Emmanoulopoulos, D.
Komin, N.
Gerard, L.
Espigat, P.
Farnier, C.
Feinstein, F.
Fiasson, A.
Foerster, A.
Giebels, B.
Heinzelmann, G.
Glicenstein, J. F.
Glueck, B.
Goret, P.
Kosack, K.
Hadjichristidis, C.
Henri, G.
Hermann, G.
Hinton, J. A.
Hoffmann, A.
Lamanna, G.
Braun, I.
Hofmann, W.
Holleran, M.
Osborne, J. L.
Hoppe, S.
Horns, D.
Jacholkowska, A.
de Jager OC
Jung, I.
Katarzynski, K.
Kaufmann, S.
Quirrenbach, A.
Lenain, J. -. P.
Kendziorra, E.
Kerschhaggl, M.
Khangulyan, D.
Ostrowski, M.
Khelifi, B.
Lohse, T.
Marandon, V.
Martin, J. M.
Martineau-Huynh, O.
Raubenheimer, B. C.
Panter, M.
Shalchi, A.
Marcowith, A.
Maurin, D.
McComb, T. J. L.
Medina, M. C.
Moderski, R.
Moulin, E.
Naumann-Godo, M.
de Naurois M
Raue, M.
Nedbal, D.
Nekrassov, D.
Skilton, J. L.
Pedaletti, G.
Niemiec, J.
Nolan, S. J.
Ohm, S.
Olive, J. -. F.
Wilhelmi, E. D. O.
Pelletier, G.
Rayner, S. M.
Petrucci, P. -. O.
Pita, S.
Puehlhofer, G.
Sol, H.
Punch, M.
Renaud, M.
Rieger, F.
Ripken, J.
Rob, L.
Spangler, D.
Charbonnier, A.
Rosier-Lees, S.
Rowell, G.
Brion, E.
Rudak, B.
Rulten, C. B.
Ruppel, J.
Sahakian, V.
Santangelo, A.
Schlickeiser, R.
Schoeck, F. M.
Chaves, R. C. G.
Stawarz, L.
Schroeder, R.
Schwanke, U.
Schwarzburg, S.
Brucker, J.
Schwemmer, S.
Steenkamp, R.
Stegmann, C.
Superina, G.
Tam, P. H.
Cheesebrough, A.
Brun, P.
First Published: Dec-2008
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2008, 492 (1), pp. L25-L28
Abstract: The rapidly varying (~10 min timescale) non-thermal X-ray emission observed from Sgr A$^{\star}$ implies that particle acceleration is occuring close to the event horizon of the supermassive black hole. The TeV $\gamma$-ray source HESS J1745-290 is coincident with Sgr A$^{\star}$ 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 $\approx$9 increase in the X-ray flux of Sgr A$^{\star}$, no evidence is found for an increase in the TeV $\gamma$-ray flux from this region. We find that an increase in the $\gamma$-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 $\gamma$-ray emission is produced within ~1014 cm (~100 $\,R_{\rm S}$) of the supermassive black hole.
DOI Link: 10.1051/0004-6361:200810912
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2008 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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