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Very high-energy gamma rays from the direction of Sagittarius A

F. Aharonian A.G. Akhperjanian K.-M. Aye A.R. Bazer-Bachi 1 M. Beilicke W. Benbow D. Berge P. Berghaus 2 K. Bernlohr O. Bolz C. Boisson 3 C. Borgneier F. Breitling A.M. Brown J. Bussons Gordo 4 P.M. Chadwick V.R. Chitnis 5 L.-M. Chounet 6 R. Cornils B. Degrange 6 A. Djannati-Atai 2 L.O'C. Drury T. Ergin P. Espigat 2 F. Feinstein 4 P. Fleury 6 G. Fontaine 6 S. Funk Y. Gallant 4 B. Giebels 6 S. Gillessen P. Goret 7 J. Guy 5 C. Hadjichristidis M. Hauser G. Heinzelmann G. Henri 8 G. Hermann M. Holleran D. Horns O.C. De Jager I. Jung B. Khelifi Nu. Komin A. Konopelko I.J. Latham R. Le Gallou M. Lemoine 6 N. Leroy 6 T. Lohse A. Marcowith 1 C. Masterson T.J.L. Mccomb M. De Naurois 5 S.J. Nolan A. Noutsos K.J. Orford M. Ouchrif 5 M. Panter G. Pelletier 8 S. Pita 2 M. Pohl G. Puhlhofer M. Punch 2 B.C. Raubenheimer M. Raue J. Raux 5 I. Redondo 6 A. Reimer O. Reimer J. Ripken M. Rivoal 5 L. Rob L. Rolland 5 G. Rowell V. Sahakian L. Sauge 8 S. Schlenker C. Schuster U. Schwanke M. Siewert H. Sol 3 R. Steenkamp C. Stegmann J.-P. Tavernet 5 C.G Theoret 2 M. Tluczykont 6 D.J. van Der Walt G. Vasileiadis 4 P. Vincent 5 B. Visser H.J. Volk S.J. Wagner
Abstract : 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.
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Submitted on : Wednesday, December 13, 2006 - 10:55:08 AM
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F. Aharonian, A.G. Akhperjanian, K.-M. Aye, A.R. Bazer-Bachi, M. Beilicke, et al.. Very high-energy gamma rays from the direction of Sagittarius A. Astronomy and Astrophysics - A&A, EDP Sciences, 2004, 425, pp.L13-L17. ⟨10.1051/0004-6361:200400055⟩. ⟨in2p3-00022258⟩



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