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Detection of very high energy radiation from HESS J1908+063 confirms the Milagro unidentified source MGRO J1908+06

Aharonian, F. / Akhperjanian, A. G. / Anton, G. / Barres De Almeida, U. / Bazer-Bachi, A. R. / Becherini, Y. / Behera, B. / Benbow, W. / Bernlöhr, K. / Boisson, C. / Bochow, A. / Borrel, V. / Braun, I. / Brion, E. / Brucker, J. / Brun, P. / Bühler, R. / Bulik, T. / Büsching, I. / Boutelier, T. / Carrigan, S. / Chadwick, P. M. / Charbonnier, A. / Chaves, R. C. G. / Cheesebrough, A. / Chounet, L.-M. / Clapson, A. C. / Coignet, G. / Dalton, M. / Daniel, M. K. / Degrange, B. / Deil, C. / Dickinson, H. J. / Djannati-Ataï, A. / Domainko, W. / O'C. Drury, L. / Dubois, F. / Dubus, G. / Dyks, J. / Dyrda, M. / Egberts, K. / Emmanoulopoulos, D. / Espigat, P. / Farnier, C. / Feinstein, F. / Fiasson, A. / Förster, A. / Fontaine, G. / Füßling, M. / Gabici, S. / Gallant, Y. A. / Gérard, L. / Giebels, B. / Glicenstein, J. F. / Glück, B. / Goret, P. / Hauser, D. / Hauser, M. / Heinz, S. / Heinzelmann, G. / Henri, G. / Hermann, G. / Hinton, J. A. / Hoffmann, A. / Hofmann, W. / Holleran, M. / Hoppe, S. / Horns, D. / Jacholkowska, A. / De Jager, O. C. / Jung, I. / Katarzyński, K. / Katz, U. / Kaufmann, S. / Kendziorra, E. / Kerschhaggl, M. / Khangulyan, D. / Khélifi, B. / Keogh, D. / Komin, N. / Kosack, K. / Lamanna, G. / Lenain, J.-P. / Lohse, T. / Marandon, V. / Martin, J. M. / Martineau-Huynh, O. / Marcowith, A. / Maurin, D. / McComb, T. J. L. / Medina, M. C. / Moderski, R. / Moulin, E. / Naumann-Godo, M. / De Naurois, M. / Nedbal, D. / Nekrassov, D. / Niemiec, J. / Nolan, S. J. / Ohm, S. / Olive, J.-F. / De Oña Wilhelmi, E. / Orford, K. J. / Ostrowski, M. / Panter, M. / Paz Arribas, M. / Pedaletti, G. / Pelletier, G. / Petrucci, P.-O. / Pita, S. / Pühlhofer, G. / Punch, M. / Quirrenbach, A. / Raubenheimer, B. C. / Raue, M. / Rayner, S. M. / Renaud, M. / Reimer, O. / Rieger, F. / Ripken, J. / Rob, L. / Rosier-Lees, S. / Rowell, G. / Rudak, B. / Rulten, C. B. / Ruppel, J. / Sahakian, V. / Santangelo, A. / Schlickeiser, R. / Schöck, F. M. / Schröder, R. / Schwanke, U. / Schwarzburg, S. / Schwemmer, S. / Shalchi, A. / Skilton, J. L. / Sol, H. / Spangler, D. / Stawarz, Ł. / Steenkamp, R. / Stegmann, C. / Superina, G. / Tam, P. H. / Tavernet, J.-P. / Terrier, R. / Tibolla, O. / Van Eldik, C. / Vasileiadis, G. / Venter, C. / Venter, L. / Vialle, J. P. / Vincent, P. / Vivier, M. / Völk, H. J. / Volpe, F. / Wagner, S. J. / Ward, M. / Zdziarski, A. A. / Zech, A. - 2009
Aims: Detection of a γ-ray source above 300 GeV is reported, confirming the unidentified source MGRO J1908+06, discovered by the Milagro collaboration at a median energy of 20 TeV. Methods: The source was observed during 27 h as part of the extension of the HESS Galactic plane survey to longitudes >30°. Results: HESS J1908+063 is detected at a significance level of 10.9σ with an integral flux above 1 TeV of (3.76 ± 0.29~stat± 0.75_sys)×10-12 ph cm-2 s-1, and a spectral photon index Γ = 2.10±0.07~stat± 0.2sys. The positions and fluxes of HESS J1908+063 and MGRO J1908+06 are in good agreement. Possible counterparts at other wavelengths and the origin of the γ-ray emission are discussed. The nearby unidentified GeV source, GRO J1908+0556 (GeV) which also remains unidentified and the new Fermi pulsar 0FGL J1907.5+0617, may be connected to the TeV source.

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