%0 Journal Article
%T First detection of a VHE gamma-ray spectral maximum from a Cosmic source: H.E.S.S. discovery of the Vela X nebula
%+ Laboratoire Leprince-Ringuet (LLR)
%+ AstroParticule et Cosmologie (APC (UMR_7164))
%+ Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE)
%+ Laboratoire de Physique Théorique et Astroparticules (LPTA)
%A Aharonian, F.
%A Akhperjanian, A.G.
%A Bazer-Bachi, A.R.
%A Beilicke, M.
%A Benbow, Wystan
%A Berge, David
%A Bernlohr, K.
%A Boisson, C.
%A Bolz, O.
%A Borrel, V.
%A Braun, I.
%A Breitling, F.
%A Brown, A.M.
%A Buhler, R.
%A Carrigan, S.
%A Chadwick, P.M.
%A Chounet, L.-M.
%A Cornils, R.
%A Costamante, L.
%A Degrange, B.
%A Dickinson, H.J.
%A Djannati-Atai, A.
%A Drury, L.O'C.
%A Dubus, G.
%A Egberts, K.
%A Emmanoulopoulos, D.
%A Espigat, P.
%A Feinstein, F.
%A Fontaine, G.
%A Funk, S.
%A Gallant, Y.
%A Giebels, B.
%A Glicenstein, J.F.
%A Goret, P.
%A Hadjichristidis, C.
%A Hauser, D.
%A Hauser, M.
%A Heinzelmann, G.
%A Henri, G.
%A Hermann, G.
%A Hinton, J.A.
%A Hofmann, W.
%A Holleran, M.
%A Horns, Dieter
%A Jacholkowska, A.
%A de Jager, O.C.
%A Khelifi, B.
%A Klages, S.
%A Komin, Nu.
%A Konopelko, A.
%A Latham, I.J.
%A Le Gallou, R.
%A Lemiere, A.
%A Lemoine-Goumard, M.
%A Lohse, T.
%A Martin, J.M.
%A Martineau-Huynh, O.
%A Marcowith, A.
%A Masterson, C.
%A Mccomb, T.J.L.
%A de Naurois, M.
%A Nedbal, D.
%A Nolan, S.J.
%A Noutsos, A.
%A Orford, K.J.
%A Osborne, J.L.
%A Ouchrif, M.
%A Panter, M.
%A Pelletier, G.
%A Pita, S.
%A Puhlhofer, G.
%A Punch, M.
%A Raubenheimer, B.C.
%A Raue, M.
%A Rayner, S.M.
%A Reimer, A.
%A Reimer, O.
%A Ripken, J.
%A Rob, L.
%A Rolland, L.
%A Rowell, G.
%A Sahakian, V.
%A Sauge, L.
%A Schlenker, S.
%A Schlickeiser, R.
%A Schuster, C.
%A Schwanke, U.
%A Siewert, M.
%A Sol, H.
%A Spangler, D.
%A Steenkamp, R.
%A Stegmann, C.
%A Superina, G.
%A Tavernet, J.-P.
%A Terrier, R.
%A Theoret, C.G.
%A Tluczykont, M.
%A van Eldik, C.
%A Vasileiadis, G.
%A Venter, C.
%A Vincent, P.
%A Volk, H.J.
%A Wagner, S.J.
%A Ward, M.
%Z 5 pages, 4 figures, accepted for publication in Astronomy and Astrophysics letters
%< avec comité de lecture
%Z APC-06-03
%@ 0004-6361
%J Astronomy and Astrophysics - A&A
%I EDP Sciences
%V 448
%P L43-L47
%8 2006
%D 2006
%Z astro-ph/0601575
%R 10.1051/0004-6361:200600014
%Z Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO]
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]Journal articles
%X The Vela supernova remnant (SNR) is a complex region containing a number of sources of non-thermal radiation. The inner section of this SNR, within 2 degrees of the pulsar PSR B0833-45, has been observed by the H.E.S.S. gamma-ray atmospheric Cherenkov detector in 2004 and 2005. A strong signal is seen from an extended region to the south of the pulsar, within an integration region of radius 0.8 deg. around the position (RA = 08h 35m 00s, dec = -45 deg. 36' J2000.0). The excess coincides with a region of hard X-ray emission seen by the ROSAT and ASCA satellites. The observed energy spectrum of the source between 550 GeV and 65 TeV is well fit by a power law function with photon index = 1.45 +/- 0.09(stat) +/- 0.2(sys) and an exponential cutoff at an energy of 13.8 +/- 2.3(stat) +/- 4.1(sys) TeV. The integral flux above 1 TeV is (1.28 +/- 0.17 (stat) +/- 0.38(sys)) x 10^{-11} cm^{-2} s^{-1}. This result is the first clear measurement of a peak in the spectral energy distribution from a VHE gamma-ray source, likely related to inverse Compton emission. A fit of an Inverse Compton model to the H.E.S.S. spectral energy distribution gives a total energy in non-thermal electrons of ~2 x 10^{45} erg between 5 TeV and 100 TeV, assuming a distance of 290 parsec to the pulsar. The best fit electron power law index is 2.0, with a spectral break at 67 TeV.
%G English
%Z HESS
%L in2p3-00025549
%U https://hal.in2p3.fr/in2p3-00025549
%~ IN2P3
%~ OBSPM
%~ CEA
%~ UNIV-PARIS7
%~ X
%~ UPMC
%~ LPTA
%~ LLR
%~ LPNHE
%~ APC
%~ CNRS
%~ UNIV-MONTP2
%~ X-LLR
%~ X-DEP
%~ X-DEP-PHYS
%~ DSM-IRFU
%~ IRFU-APC
%~ PSL
%~ UPMC_POLE_2
%~ UNIV-MONTPELLIER
%~ CEA-DRF
%~ SORBONNE-UNIVERSITE
%~ SU-SCIENCES
%~ UNIV-PARIS
%~ UP-SCIENCES
%~ OBSPM-PSL
%~ SU-TI
%~ ALLIANCE-SU
%~ UM1-UM2
%~ LPNHE-2