%0 Journal Article
%T FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT G8.7-0.1
%+ Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112))
%+ Laboratoire Leprince-Ringuet (LLR)
%+ Laboratoire Univers et Particules de Montpellier (LUPM)
%+ Institut de recherche en astrophysique et planétologie (IRAP)
%+ GLAST
%A Ajello, Marco
%A Allafort, A.
%A Baldini, Luca
%A Ballet, Jean
%A Barbiellini, Guido
%A Bastieri, D.
%A Bechtol, K.
%A Bellazzini, R.
%A Berenji, B.
%A D. Blandford, R.
%A D. Bloom, E.
%A Bonamente, E.
%A W. Borgland, A.
%A Bregeon, J.
%A Brigida, M.
%A Bruel, Pascal
%A Buehler, R.
%A Buson, S.
%A A. Caliandro, G.
%A A. Cameron, R.
%A Caraveo, P. A.
%A M. Casandjian, J.
%A Cecchi, C.
%A Charles, E.
%A Chekhtman, A.
%A Ciprini, S.
%A Claus, R.
%A Cohen-Tanugi, J.
%A Cutini, S.
%A de Angelis, A.
%A de Palma, F.
%A D. Dermer, C.
%A Do Couto E Silva, E.
%A S. Drell, P.
%A Drlica-Wagner, A.
%A Dubois, R.
%A Favuzzi, C.
%A J. Fegan, S.
%A C. Ferrara, E.
%A B. Focke, W.
%A Frailis, M.
%A Fukazawa, Y.
%A Fukui, Y.
%A Fusco, P.
%A Gargano, F.
%A Gasparrini, D.
%A Germani, S.
%A Giglietto, N.
%A Giommi, P.
%A Giordano, F.
%A Giroletti, M.
%A Glanzman, T.
%A Godfrey, G.
%A E. Grove, J.
%A Guiriec, S.
%A Hadasch, D.
%A Hanabata, Y.
%A K. Harding, A.
%A Hayashi, K.
%A Hays, E.
%A Itoh, R.
%A Jóhannesson, G.
%A S. Johnson, A.
%A Kamae, T.
%A Katagiri, H.
%A Kataoka, J.
%A Knödlseder, Jürgen
%A Kubo, H.
%A Kuss, M.
%A Lande, J.
%A Latronico, L.
%A Lee, S.-H.
%A M. Lionetto, A.
%A Longo, F.
%A Loparco, F.
%A N. Lovellette, M.
%A Lubrano, P.
%A N. Mazziotta, M.
%A Mehault, J.
%A F. Michelson, P.
%A Mizuno, T.
%A A. Moiseev, A.
%A Monte, C.
%A E. Monzani, M.
%A Morselli, A.
%A V. Moskalenko, I.
%A Murgia, S.
%A Nakamori, T.
%A Naumann-Godo, M.
%A Nishino, S.
%A L. Nolan, P.
%A P. Norris, J.
%A Nuss, E.
%A Ohno, M.
%A Ohsugi, T.
%A Okumura, A.
%A Omodei, N.
%A Orlando, E.
%A F. Ormes, J.
%A Paneque, D.
%A Parent, D.
%A Pelassa, V.
%A Pesce-Rollins, M.
%A Pierbattista, M.
%A Piron, F.
%A Porter, T.A.
%A Rainò, S.
%A Rando, R.
%A Reimer, A.
%A Reimer, O.
%A Reposeur, T.
%A Roth, M.
%A F.-W. Sadrozinski, H.
%A Sgrò, C.
%A J. Siskind, E.
%A D. Smith, P.
%A Spandre, G.
%A Spinelli, P.
%A J. Suson, D.
%A Tajima, H.
%A Takahashi, H.
%A Tanaka, T.
%A G. Thayer, J.
%A B. Thayer, J.
%A Tibaldo, L.
%A Tibolla, O.
%A F. Torres, D.
%A Tosti, G.
%A Tramacere, A.
%A Troja, E.
%A Uchiyama, Y.
%A Uehara, T.
%A L. Usher, T.
%A Vandenbroucke, J.
%A van Etten, A.
%A Vasileiou, V.
%A Vianello, G.
%A Vilchez, N.
%A Vitale, V.
%A P. Waite, A.
%A Wang, P.
%A L. Winer, B.
%A S. Wood, K.
%A Yamamoto, H.
%A Yamazaki, R.
%A Yang, Z.
%A Yasuda, H.
%A Ziegler, M.
%A Zimmer, S.
%< avec comité de lecture
%@ 0004-637X
%J The Astrophysical Journal
%I American Astronomical Society
%V 744
%P 80
%8 2012-01-08
%D 2012
%Z 1109.3017
%R 10.1088/0004-637X/744/1/80
%K acceleration of particles
%K cosmic rays
%K gamma rays: ISM
%K ISM: individual objects (G8.7-0.1
%K HESS J1804-216)
%K ISM: supernova remnants
%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 We present a detailed analysis of the GeV gamma-ray emission toward the supernova remnant (SNR) G8.7-0.1 with the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. An investigation of the relationship between G8.7-0.1 and the TeV unidentified source HESS J1804-216 provides us with an important clue on diffusion process of cosmic rays if particle acceleration operates in the SNR. The GeV gamma-ray emission is extended with most of the emission in positional coincidence with the SNR G8.7-0.1 and a lesser part located outside the western boundary of G8.7-0.1. The region of the gamma-ray emission overlaps spatially connected molecular clouds, implying a physical connection for the gamma-ray structure. The total gamma-ray spectrum measured with LAT from 200 MeV-100 GeV can be described by a broken power-law function with a break of 2.4 ± 0.6 (stat) ± 1.2 (sys) GeV, and photon indices of 2.10 ± 0.06 (stat) ± 0.10 (sys) below the break and 2.70 ± 0.12 (stat) ± 0.14 (sys) above the break. Given the spatial association among the gamma rays, the radio emission of G8.7-0.1, and the molecular clouds, the decay of π0s produced by particles accelerated in the SNR and hitting the molecular clouds naturally explains the GeV gamma-ray spectrum. We also find that the GeV morphology is not well represented by the TeV emission from HESS J1804-216 and that the spectrum in the GeV band is not consistent with the extrapolation of the TeV gamma-ray spectrum. The spectral index of the TeV emission is consistent with the particle spectral index predicted by a theory that assumes energy-dependent diffusion of particles accelerated in an SNR. We discuss the possibility that the TeV spectrum originates from the interaction of particles accelerated in G8.7-0.1 with molecular clouds, and we constrain the diffusion coefficient of the particles.
%G English
%L in2p3-00664467
%U https://hal.in2p3.fr/in2p3-00664467
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