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Serendipitous discovery of the unidentified extended TeV gamma-ray source HESS J1303-631

Aharonian, F. / Akhperjanian, A.G. / Aye, K.-M. / Bazer-Bachi, A.R. / Beilicke, M. / Benbow, W. / Berge, D. / Berghaus, P. / Bernlohr, K. / Boisson, C. / Bolz, O. / Braun, I. / Breitling, F. / Brown, A.M. / Bussons Gordo, J. / Chadwick, P.M. / Chounet, L.-M. / Cornils, R. / Costamante, L. / Degrange, B. / Djannati-Ataï, A. / Drury, L.O'C. / Dubus, G. / Emmanoulopoulos, D. / Espigat, P. / Feinstein, F. / Fleury, P. / Fontaine, G. / Fuchs, Y. / Funk, S. / Gallant, Y.A. / Giebels, B. / Gillessen, S. / Glicenstein, J.F. / Goret, P. / Hadjichristidis, C. / Hauser, M. / Heinzelmann, G. / Henri, G. / Hermann, G. / Hinton, J.A. / Hofmann, W. / Holleran, M. / Horns, D. / De Jager, O.C. / Khelifi, B. / Komin, Nu. / Konopelko, A. / Latham, I.J. / Le Gallou, R. / Lemière, A. / Lemoine-Goumard, M. / Leroy, N. / Lohse, T. / Martineau-Huynh, O. / Marcowith, A. / Masterson, C. / Mccomb, 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. / Puhlhofer, G. / Punch, M. / Raubenheimer, B.C. / Raue, M. / Raux, J. / Rayner, S.M. / Redondo, I. / Reimer, A. / Reimer, O. / Ripken, J. / Rob, L. / Rolland, L. / Rowell, G. / Sahakian, V. / Sauge, L. / Schlenker, S. / Schlickeiser, R. / Schuster, C. / Schwanke, U. / Siewert, M. / Sol, H. / Steenkamp, R. / Stegmann, C. / Tavernet, J.-P. / Terrier, R. / Théoret, C.G. / Tluczykont, M. / Van Der Walt, D.J. / Vasileiadis, G. / Venter, C. / Vincent, P. / Volk, H.J. / Wagner, S.J. - 2015
The serendipitous discovery of an unidentified extended TeV $\gamma$-ray source close to the galactic plane named HESS J1303-631 at a significance of 21 standard deviations is reported. The observations were performed between February and June 2004 with the H.E.S.S. stereoscopic system of Cherenkov telescopes in Namibia. HESS J1303-631 was discovered roughly 0.6 \degres north of the binary system PSR B1259-63/SS 2883, the target object of the initial observation campaign which was also detected at TeV energies in the same field of view. HESS J1303-631 is extended with a width of an assumed intrinsic Gaussian emission profile of $\sigma$ = (0.16 $\pm$ 0.02)\degres and the integral flux above 380 GeV is compatible with constant emission over the entire observational period of (17$\pm$ 3)% of the Crab Nebula flux. The measured energy spectrum can be described by a power-law dN/dE $\sim$ E$^{-\Gamma}$ with a photon index of $\Gamma$ = 2.44 $\pm 0.05$_{stat} \pm$ 0.2$_{syst}$. Up to now, no counterpart at other wavelengths is identified. Various possible TeV production scenarios are discussed.

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