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Document Version Version Comment Date Status
396159.0 [No comment] 18.12.2008 14:04 Released

ID: 396159.0, MPI für Kernphysik / High-Energy Astrophysics
Simultaneous HESS and Chandra observations of Sagitarius A during an X-ray flare
Authors:Aharonian, F.; Akhperjanian, A. G.; Barres de Almeida, U.; Bazer-Bachi, A. R.; Behera, B.; Benbow, Wystan; Bernloehr, K.; Boisson, C.; Bochow, Anne; Borrel, V.; Braun, I.; Brion, E.; Brucker, J.; Buehler, R.; Bulik, T.; Buesching, I.; Boutelier, T.; Carrigan, S.; Chadwick, P. M.; Chounet, L. M.; Clapson, André-Claude; Coignet, G.; Dalton, M.; Degrange, B.; Dickinson, H. J.; Djannati-Atai, A.; Domainko, W.; Drury, L. O.; Dubois, F.; Dubus, G.; Dyks, J.; Egberts, K.; Emmanoulopoulos, D.; Espigat, P.; Farnier, C.; Feinstein, F.; Fiasson, A.; Foerster, Andreas; Fontaine, G.; Fuessling, M.; Gallant, Y. A.; Giebels, B.; Glicenstein, J. F.; Glueck, B.; Goret, P.; Hadjichristidis, C.; Hauser, Dominik; Hauser, M.; Heinzelmann, G.; Henri, G.; Hermann, German; Hinton, J. A.; Hoffmann, A.; Hofmann, Werner; Holleran, M.; Hoppe, Stefan; Horns, D.; Jacholkowska, A.; de Jager, O. C.; Jung, I.; Katarzynski, K.; Kendziorra, E.; Kerschhaggl, M.; Khelifi, B.; Keogh, D.; Komin, N.; Kosack, K.; Lamanna, G.; Lohse, T.; Lenain, J. P.; Marandon, V.; Martin, J. M.; Martineau-Huynh, O.; Marcowith, A.; Maurin, D.; McComb, T. J. L.; Moderski, R.; Moulin, E.; Naumann-Godo, M.; de Naurois, M.; Nedbal, D.; Nekrassov, Daniil; Nolan, S. J.; Ohm, Stefan; Olive, J. P.; de Ona Wilhelmi, E.; Orford, K. J.; Osborne, J. L.; Ostrowski, M.; Panter, Michael; Pedaletti, G.; Pelletier, G.; Petrucci, P. O.; Pita, S.; Puehlhofer, G.; Punch, M.; Quirrenbach, A.; Raubenheimer, B. C.; Raue, Martin; Rayner, S. M.; Renaud, Matthieu; Ripken, J.; Rob, L.; Rosier-Lees, S.; Rowell, G.; Rudak, B.; Ruppel, J.; Sahakian, V.; Santangelo, A.; Schlickeiser, R.; Schoeck, F. M.; Schroeder, R.; Schwanke, U.; Schwarzburg, S.; Schwemmer, S.; Shalchi, A.; Sol, H.; Spangler, D.; Stawarz, L.; Steenkamp, R.; Stegmann, C.; Superina, G.; Tam, P. H.; Tavernet, J. P.; Terrier, R.; van Eldik, C.; Vasileiadis, G.; Venter, C.; Vialle, J. P.; Vincent, P.; Vivier, M.; Voelk, H. J.; Volpe, F.; Wagner, S. J.; Ward, M.; Zdziarski, A. A.; Zech, A.; Becherini, Y.; Brun, P.; Charbonnier, A.; Chaves, Ryan; Cheesebrough, A.; Deil, Christoph; Dyrda, M.; Gérard, L.; Heinz, S.; Kaufmann, S.; Khangulyan, Dmitry; Medina, M.C.; Niemic, J.; Rieger, Frank; Rulten, C.B.; Skilton, J.L.; Tibolla, O.
Date of Publication (YYYY-MM-DD):2008
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Issue / Number:1
Start Page:L25
End Page:L28
Review Status:Peer-review
Audience:Experts Only
Abstract / Description: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 -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 -ray flux from this region. We find that an increase in the -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 -ray emission is produced within ~1014 cm (~100 ) of the supermassive black hole.
Free Keywords:Hess
X-rays: individuals: Sgr A* -- gamma rays: observations
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of W. Hofmann/Experimental High-Energy Astrophysics (M. Panter, G. Hermann)
MPI für Kernphysik/Group of W. Hofmann/High Energy Astrophysics (F. Aharonian)
External Affiliations:Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland
Yerevan Physics Institute, 2 Alikhanian Brothers St., 375036 Yerevan, Armenia
University of Durham, Department of Physics, South Road, Durham DH1 3LE, UK
Centre d'Étude Spatiale des Rayonnements, CNRS/UPS, 9 Av. du Colonel Roche, BP 4346, 31029 Toulouse Cedex 4, France
Astroparticule et Cosmologie (APC), CNRS, Universite Paris 7 Denis Diderot, 10 rue Alice Domon et Leonie Duquet, 75205 Paris Cedex 13, France (UMR 7164 (CNRS, Université Paris VII, CEA, Observatoire de Paris).)
Landessternwarte, Universität Heidelberg, Königstuhl, 69117 Heidelberg, Germany
Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
LUTH, Observatoire de Paris, CNRS, Université Paris Diderot, 5 Place Jules Janssen, 92190 Meudon, 
IRFU/DSM/CEA, CE Saclay, 91191 Gif-sur-Yvette Cedex, France
Universität Erlangen-Nürnberg, Physikalisches Institut, Erwin-Rommel-Str. 1, 91058 Erlangen, Germany
Nicolaus Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland
Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa
Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
LPNHE, Université Pierre et Marie Curie Paris 6, Université Denis Diderot Paris 7, CNRS/IN2P3, 4 Place Jussieu, 75252 Paris Cedex 5, France
Laboratoire Leprince-Ringuet, École Polytechnique, CNRS/IN2P3, 91128 Palaiseau, France
Laboratoire d'Annecy-le-Vieux de Physique des Particules, CNRS/IN2P3, 9 Chemin de Bellevue, BP 110, 74941 Annecy-le-Vieux Cedex, France
Instytut Fizyki Jądrowej PAN, ul. Radzikowskiego 152, 31-342 Kraków, Poland
Laboratoire de Physique Théorique et Astroparticules, CNRS/IN2P3, Université Montpellier II, CC 70, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany
School of Physics & Astronomy, University of Leeds, Leeds LS2 9JT, UK
e-mail: j.a.hinton@leeds.ac.uk
Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, 72076 Tübingen, Germany
Toruń Centre for Astronomy, Nicolaus Copernicus University, ul. Gagarina 11, 87-100 Toruń, Poland
Institute of Particle and Nuclear Physics, Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic
European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG
Obserwatorium Astronomiczne, Uniwersytet Jagielloński, ul. Orla 171, 30-244 Kraków, Poland
School of Chemistry & Physics, University of Adelaide, Adelaide 5005, Australia
Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
University of Namibia, Private Bag 13301, Windhoek, Namibia