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Very high energy gamma rays from the direction of Sagittarius A

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posted on 24.10.2012, 08:53 by F. Aharonian, A. G. Akhperjanian, KM. Aye, A. R. Bazer-Bachi, M. Beilicke, W. Benbow, D. Berge, P. Berghaus, K. Bernlohr, O. Bolz, C. Boisson, C. Borgmeier, F. Breitling, A. M. Brown, J. B. Gordo, P. M. Chadwick, V. R. Chitnis, L. M. Chounet, R. Cornils, L. Costamante, B. Degrange, A. Djannati-Atai, L. O. Drury, T. Ergin, P. Espigat, F. Feinstein, P. Fleury, G. Fontaine, S. Funk, Y. Gallant, B. Giebels, S. Gillessen, P. Goret, J. Guy, C. Hadjichristidis, M. Hauser, G. Heinzelmann, G. Henri, G. Hermann, J. A. Hinton, W. Hofmann, M. Holleran, D. Horns, de Jager O. C., I. Jung, B. Khelifi, N. Komin, A. Konopelko, IJ. Latham, Le Gallou R., M. Lemoine, A. Lemiere, N. Leroy, T. Lohse, A. Marcowith, C. Masterson, T. J. L. McComb, de Naurois A., S. J. Nolan, A. Noutsos, K. J. Orford, J. L. Osborne, M. Ouchrif, M. Panter, G. Pelletier, S. Pita, M. Pohl, G. Puhlhofer, M. Punch, B. C. Raubenheimer, M. Raue, J. Raux, S. M. Rayner, I. Redondo, A. Reimer, O. Reimer, J. Ripken, M. Rivoal, L. Rob, L. Rolland, G. Rowell, V. Sahakian, L. Sauge, S. Schlenker, R. Schlickeiser, C. Schuster, U. Schwanke, M. Siewert, H. Sol, R. Steenkamp, C. Stegmann, J. P. Tavernet, C. G. Theoret, M. Tluczykont, van der Walt D. J., G. Vasileiadis, P. Vincent, B. Visser, H. J. Volk, S. J. Wagner
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 HESS array of Cherenkov telescopes. The $\gamma$-rays exhibit a power-law energy spectrum with a spectral index of $-2.2 \pm 0.09 \pm 0.15$ and a flux above the 165 GeV threshold of $(1.82 \pm 0.22) \times 10^{-7}$ m -2 s -1. The measured flux and spectrum differ substantially from recent results reported in particular by the CANGAROO collaboration.



Astronomy & Astrophysics, 2004, 425 (1), pp. L13-L17


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