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Title: Serendipitous discovery of the unidentified extended TeV gamma-ray source HESS J1303-631
Authors: 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.
Gordo, J. B.
Chadwick, P. M.
Chounet, L. M.
Cornils, R.
Costamante, L.
Degrange, B.
Djannati-Atai, A.
Drury, L. O.
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, JA.
Hofmann, W.
Holleran, M.
Horns, D.
de Jager O. C.
Khelifi, B.
Komin, N.
Konopelko, A.
Latham, IJ.
Le Gellou R.
Lemiere, 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.
Theoret, C. G.
Tluczykont, M.
van der Walt D. J.
Vasileiadis, G.
Venter, C.
Vincent, P.
Volk, H. J.
Wagner, S. J.
First Published: Sep-2005
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: ASTRONOMY & ASTROPHYSICS, 2005, 439 (3), pp. 1013-1021
Abstract: 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 HESS stereoscopic system of Cherenkov telescopes in Namibia. HESS J1303-631 was discovered roughly $0.6\degr$ 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 $\sigma = (0.16 \pm 0.02)\degr$ and the integral flux above $380\,\mathrm{GeV}$ 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 $\mathrm{d}N/\mathrm{d}E \sim E^{-\Gamma}$ with a photon index of $\Gamma = 2.44 \pm 0.05_{\mathrm{stat}} \pm 0.2_{\mathrm{syst}}$. Up to now, no counterpart at other wavelengths is identified. Various possible TeV production scenarios are discussed.
DOI Link: 10.1051/0004-6361:20053195
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2005 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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