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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.

History

Citation

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

Version

VoR (Version of Record)

Published in

Astronomy & Astrophysics

Publisher

EDP Sciences for European Southern Observatory (ESO)

issn

0004-6361

Copyright date

2004

Available date

24/10/2012

Publisher version

http://www.aanda.org/articles/aa/abs/2004/37/aagf291/aagf291.html

Language

en

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