%0 Journal Article
%T Discovery of the hard spectrum VHE gamma-ray source HESS J1641-463
%+ Laboratoire Leprince-Ringuet (LLR)
%+ Laboratoire Univers et Théories (LUTH (UMR_8102))
%+ Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE)
%+ Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU)
%+ AstroParticule et Cosmologie (APC (UMR_7164))
%+ Laboratoire Univers et Particules de Montpellier (LUPM)
%+ Laboratoire d'Annecy de Physique des Particules (LAPP)
%+ Astroparticules (ASTRO)
%A Abramowski, A.
%A Aharonian, F.
%A Benkhali, F. Ait
%A Akhperjanian, A. G.
%A Angüner, E. O.
%A Backes, M.
%A Balenderan, S.
%A Balzer, Agnès
%A Barnacka, A.
%A Becherini, Y.
%A Tjus, J. Becker
%A Berge, D.
%A Bernhard, S.
%A Bernlöhr, K.
%A Birsin, E.
%A Biteau, J.
%A Böttcher, M.
%A Boisson, C.
%A Bolmont, J.
%A Bordas, P.
%A Bregeon, J.
%A Brun, F.
%A Brun, P.
%A Bryan, M.
%A Bulik, T.
%A Carrigan, S.
%A Casanova, S.
%A Chadwick, P. M.
%A Chakraborty, N.
%A Chalme-Calvet, R.
%A Chaves, R. C. G.
%A Chrétien, M.
%A Colafrancesco, S.
%A Cologna, G.
%A Conrad, J.
%A Couturier, C.
%A Cui, Y.
%A Davids, I. D.
%A Degrange, B.
%A Deil, C.
%A Dewilt, P.
%A Djannati-Ataï, A.
%A Domainko, W.
%A Donath, A.
%A Drury, L. O'C.
%A Dubus, G.
%A Dutson, K.
%A Dyks, J.
%A Dyrda, M.
%A Edwards, T.
%A Egberts, K.
%A Eger, P.
%A Espigat, P.
%A Farnier, C.
%A Fegan, S.
%A Feinstein, F.
%A Fernandes, M. V.
%A Fernandez, D.
%A Fiasson, A.
%A Fontaine, G.
%A Förster, A.
%A Füssling, M.
%A Gabici, S.
%A Gajdus, M.
%A Gallant, Y. A.
%A Garrigoux, T.
%A Giavitto, G.
%A Giebels, B.
%A Glicenstein, J. F.
%A Gottschall, D.
%A Grondin, M. -H.
%A Grudzińska, M.
%A Hadasch, D.
%A Häffner, S.
%A Hahn, J.
%A Harris, J.
%A Heinzelmann, G.
%A Henri, G.
%A Hermann, G.
%A Hervet, O.
%A Hillert, A.
%A Hinton, J. A.
%A Hofmann, W.
%A Hofverberg, P.
%A Holler, M.
%A Horns, D.
%A Ivascenko, A.
%A Jacholkowska, A.
%A Jahn, C.
%A Jamrozy, M.
%A Janiak, M.
%A Jankowsky, F.
%A Jung-Richardt, I.
%A Kastendieck, M. A.
%A Katarzyński, K.
%A Katz, U.
%A Kaufmann, S.
%A Khélifi, B.
%A Kieffer, Michel
%A Klepser, S.
%A Klochkov, D.
%A Kluźniak, W.
%A Kolitzus, D.
%A Komin, Nu.
%A Kosack, K.
%A Krakau, S.
%A Krayzel, F.
%A Krüger, P. P.
%A Laffon, H.
%A Lamanna, G.
%A Lau, J.
%A Lefaucheur, J.
%A Lefranc, V.
%A Lemière, A.
%A Lemoine-Goumard, M.
%A Lenain, J. -P.
%A Lohse, T.
%A Lopatin, A.
%A Lu, C. -C.
%A Marandon, V.
%A Marcowith, Alexandre
%A Marx, R.
%A Maurin, G.
%A Maxted, N.
%A Mayer, M.
%A Mccomb, T. J. L.
%A Méhault, J.
%A Meintjes, P. J.
%A Menzler, U.
%A Meyer, M.
%A Mitchell, A. M. W.
%A Moderski, R.
%A Mohamed, M.
%A Morå, K.
%A Moulin, Emmanuel
%A Murach, T.
%A de Naurois, M.
%A Niemiec, J.
%A Nolan, S. J.
%A Oakes, L.
%A Odaka, H.
%A Ohm, S.
%A Opitz, B.
%A Ostrowski, M.
%A Oya, I.
%A Panter, M.
%A Parsons, R. D.
%A Arribas, M. Paz
%A Pekeur, N. W.
%A Pelletier, G.
%A Petrucci, P. -O.
%A Peyaud, B.
%A Pita, S.
%A Poon, H.
%A Pühlhofer, G.
%A Punch, M.
%A Quirrenbach, A.
%A Raab, S.
%A Reichardt, I.
%A Reimer, A.
%A Reimer, O.
%A Renaud, Matthieu
%A Reyes, R. de Los
%A Rieger, F.
%A Romoli, C.
%A Rosier-Lees, S.
%A Rowell, G.
%A Rudak, B.
%A Rulten, C. B.
%A Sahakian, V.
%A Salek, D.
%A Sanchez, D. A.
%A Santangelo, A.
%A Schlickeiser, R.
%A Schüssler, F.
%A Schulz, A.
%A Schwanke, U.
%A Schwarzburg, S.
%A Schwemmer, S.
%A Sol, H.
%A Spanier, F.
%A Spengler, G.
%A Spies, F.
%A Stawarz, {ł. }
%A Steenkamp, R.
%A Stegmann, C.
%A Stinzing, F.
%A Stycz, K.
%A Sushch, I.
%A Tavernet, J. -P.
%A Tavernier, T.
%A Taylor, A. M.
%A Terrier, R.
%A Tluczykont, M.
%A Trichard, C.
%A Valerius, K.
%A van Eldik, C.
%A van Soelen, B.
%A Vasileiadis, George
%A Veh, J.
%A Venter, C.
%A Viana, A.
%A Vincent, P.
%A Vink, J.
%A Völk, H. J.
%A Volpe, F.
%A Vorster, M.
%A Vuillaume, T.
%A Wagner, S. J.
%A Wagner, P.
%A Wagner, R. M.
%A Ward, M.
%A Weidinger, M.
%A Weitzel, Q.
%A White, R.
%A Wierzcholska, A.
%A Willmann, P.
%A Wörnlein, A.
%A Wouters, D.
%A Yang, R.
%A Zabalza, V.
%A Zaborov, D.
%A Zacharias, M.
%A Zdziarski, A. A.
%A Zech, A.
%A Zechlin, H. -S.
%A Fukui, Y.
%A Sano, H.
%A Fukuda, T.
%A Yoshiike, S.
%Z 24 pages, 4 figures, submitted to ApJ, letters
%< avec comité de lecture
%@ 2041-8205
%J The Astrophysical journal letters
%I Bristol : IOP Publishing
%V 794
%N 1
%P L1
%8 2014
%D 2014
%Z 1408.5280
%Z 2014ApJ...794L...1A
%R 10.1088/2041-8205/794/1/L1
%Z Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]Journal articles
%X This letter reports the discovery of a remarkably hard spectrum source, HESS J1641-463, by the High Energy Stereoscopic System (H.E.S.S.) in the very-high energy (VHE) domain. HESS J1641-463 remained unnoticed by the usual analysis techniques due to confusion with the bright nearby source HESS J1640-465. It emerged at a significance level of 8.5 standard deviations after restricting the analysis to events with energies above 4 TeV. It shows a moderate flux level of F(E > 1 TeV) = (3.64 +/- 0.44_stat +/- 0.73_sys) x 10^-13 cm^-2s-1, corresponding to 1.8% of the Crab Nebula flux above the same energy, and a hard spectrum with a photon index of Gamma = 2.07 +/- 0.11_stat +/- 0.20_sys. It is a point-like source, although an extension up to Gaussian width of sigma = 0.05 deg cannot be discounted due to uncertainties in the H.E.S.S. PSF. The VHE gamma-ray flux of HESS J1641-463 is found to be constant over the observed period when checking time binnings from year-by-year to the 28 min exposures timescales. HESS J1641-463 is positionally coincident with the radio supernova remnant SNR G338.5+0.1. No X-ray candidate stands out as a clear association, however Chandra and XMM-Newton data reveal some potential weak counterparts. Various VHE gamma-ray production scenarios are discussed. If the emission from HESS J1641-463 is produced by cosmic ray protons colliding with the ambient gas, then their spectrum must extend up to at least a few hundred TeV. The energy released in accelerating these particles could account for the entire energy budget of the galactic cosmic ray population above a few TeV.
%G English
%Z HESS
%L in2p3-01061876
%U https://hal.in2p3.fr/in2p3-01061876
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