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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents



  history
ID: 197917.0, MPI für Kernphysik / High-Energy Astrophysics
Very high energy gamma rays from the direction of Sagittarius A*
Authors:Aharonian, F.; Akhperjanian, A.G.; Aye, K.-M.; Bazer-Bachi, A.R.; Beilicke, M.; Benbow, W.; Berge, D.; Berghaus, P.; Bernlöhr, K.; Bolz, O.; Boisson, C.; Borgmeier, C.; Breitling, F.; Brown, A.M.; Bussons Gordo, J.; Chadwick, P.M.; Chitnis, V.R.; Chounet, L.-M.; Cornils, R.; Costamante, L.; Degrange, B.; Djannati-Ataï, A.; O'C Drury, L.; Ergin, T.; Espigat, P.; Feinstein, F.; Fleury, P.; Fontaine, G.; Funk, S.; Gallant, Y.; Giebels, B.; Gillessen, S.; Goret, P.; Guy, J.; Hadjichristidis, C.; Hauser, M.; Heinzelmann, G.; Henri, G.; Hermann, G.; Hinton, J.A.; Hofmann, W.; Holleran, M.; Horns, D.; de Jager, O.C.; Jung, I.; Khélifi, B.; Komin, Nu.; Konopelko, A.; Latham, I.J.; Le Gallou, R.; Lemoine, M.; Lemière, A.; Leroy, N.; Lohse, T.; Marcowith, A.; Masterson, C.; Mc Comb, T.J.L.; de Naurois, M.; Nolan, S.J.; Noutsos, A.; Orford, K.J.; Osborne, J.L.; Ouchrif, M.; Panter, M.; Pelletier, G.; Pita, S.; Pohl, M.; Pühlhofer, G.; Punch, M.; Raubenheimer, B.C.; Raue, M.; Raux, J.; Rayner, S.M.; Redondo, I.; Reimer, A.; Reimer, O.; Ripken, J.; Rivoal, M.; Rob, L.; Rolland, L.; Rowell, G.; Sahakian, V.; Saugé, L.; Schlencker, S.; Schlickeiser, R.; Schuster, C.; Schwanke, U.; Siewert, M.; Sol, H.; Steenkamp, R.; Stegmann, C.; Tavernet, J.-P.; Théoret, C.G.; Tluczykont, M.; van der Walt, D.J.; Vasileiadis, G.; Vincent, P.; Visser, B.; Völk, H.J.; Wagner, S.J.
Language:English
Date of Publication (YYYY-MM-DD):2004-08
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A & A
Volume:425
Start Page:L13
End Page:L17
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:We report the detection of a point-like source of very high energy (VHE) gamma-rays coincident within 1' of Sgr A*, obtained with the H.E.S.S. array of Cherenkov telescopes. The gamma-rays exhibit a power-law energy spectrum with a spectral index of -2.2 +/- 0.09 +/- 0.15 and a flux above the 165 GeV threshold of (1.82 +/- 0.22) \times 10^{-7} m^{-2} s^{-1}. The measured flux and spectrum differ substantially from recent results reported in particular by the CANGAROO collaboration.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group H. J. Völk/High Energy Astrophysics (F. Aharonian)
MPI für Kernphysik/Group W. Hofmann/Experimental High-Energy Astrophysics (M. Panter, G. Hermann)
External Affiliations:Yerevan Physics Institute, 2 Alikhanian Brothers St., 375036 Yerevan, Armenia
University of Durham, Department of Physics, South Road, Durham DH1 3LE, U.K.
Centre d'Etude Spatiale des Rayonnements, CNRS/UPS, 9 ev. du Colonel Roche, BP 4346, 31029 Toulouse Cedex 4, France
Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany
Physique Corpusculaire et Cosmologie, IN2P3/CNRS, Collège de France, 11 Place Marcelin Berthelot, 75231 Paris Cedex 05, France
Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, 12489 Berlin, Germany
LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France
Groupe d'Astroparticules de Montpellier, IN2P3/CNRS, Université Montpellier II, CC85, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
Laboratoire de Physique Nucléaire et des Hautes Energies, IN2P3/CNRS, Universités Paris VI & VII, 4 Place Jussieu, 75231 Paris Cedex 05, France
Laboratoire Leprince-Ringuet, IN2P3/CNRS, Ecole Polytechnique, 91128 Palaiseau, France
Dublin Institute for Advanced Studies, 5 Merrion Square, Dublin 2, Ireland
Service d'Astrophysique, DAPNIA/DSM/CEA, CE Saclay, 91191 Gif-sur-Yvette, France
Landessternwarte, Königstuhl, 69117 Heidelberg, Germany
Laboratoire d'Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France
Unit for Space Physics, North-West University, Potchefstroom 2520, South Africa
Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, 44780 Bochum, Germany
Institute of Particle and Nuclear Physics, Charles University, V Holesovickach 2, 180 00 Prague 8, Czech Republic
University of Namibia, Private Bag 13301, Windhoek, Namibia
European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG
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