A. ABDO, A.; ACKERMANN, Markus; AJELLO, Marco; BALDINI, Luca; BALLET, Jean; BARBIELLINI, Guido; G. BARING, M.; BASTIERI, D.; M. BAUGHMAN, B.; BECHTOL, K.; BELLAZZINI, R.; BERENJI, B.; D. BLANDFORD, R.; D. BLOOM, E.; BONAMENTE, E.; W. BORGLAND, A.; BREGEON, J.; BREZ, A.; BRIGIDA, M.; BRUEL, Pascal; H. BURNETT, T.; BUSON, S.; A. CALIANDRO, G.; A. CAMERON, R.; CARAVEO, P. A.; M. CASANDJIAN, J.; CECCHI, C.; ÇELIK, Ö.; CHEKHTMAN, A.; C. CHEUNG, C.; CHIANG, J.; CIPRINI, S.; CLAUS, R.; COGNARD, Ismaël; COHEN-TANUGI, J.; R. COMINSKY, L.; CONRAD, J.; CUTINI, S.; D. DERMER, C.; DE ANGELIS, A.; DE PALMA, F.; W. DIGEL, S.; DO COUTO E SILVA, E.; S. DRELL, P.; DUBOIS, R.; DUMORA, D.; ESPINOZA, C.; FARNIER, C.; FAVUZZI, C.; J. FEGAN, S.; B. FOCKE, W.; FORTIN, P.; FRAILIS, M.; FUKAZAWA, Y.; FUNK, S.; FUSCO, P.; GARGANO, F.; GASPARRINI, D.; GEHRELS, N.; GERMANI, S.; GIAVITTO, G.; GIEBELS, B.; GIGLIETTO, N.; GIORDANO, F.; GLANZMAN, T.; GODFREY, G.; A. GRENIER, I.; GRONDIN, M.-H.; E. GROVE, J.; GUILLEMOT, L.; GUIRIEC, S.; HANABATA, Y.; K. HARDING, A.; HAYASHIDA, M.; HAYS, E.; E. HUGHES, R.; S. JACKSON, M.; JÓHANNESSON, G.; S. JOHNSON, A.; J. JOHNSON, T.; N. JOHNSON, W.; KAMAE, T.; KATAGIRI, H.; KATAOKA, J.; KATSUTA, J.; KAWAI, N.; KERR, M.; KNÖDLSEDER, Jürgen; L. KOCIAN, M.; KRAMER, M.; KUSS, M.; LANDE, J.; LATRONICO, L.; LEMOINE-GOUMARD, M.; LONGO, F.; LOPARCO, F.; LOTT, B.; N. LOVELLETTE, M.; LUBRANO, P.; G. LYNE, A.; M. MADEJSKI, G.; MAKEEV, A.; N. MAZZIOTTA, M.; E. MCENERY, J.; MEURER, C.; F. MICHELSON, P.; MITTHUMSIRI, W.; MIZUNO, T.; MONTE, C.; E. MONZANI, M.; MORSELLI, A.; V. MOSKALENKO, I.; MURGIA, S.; NAKAMORI, T.; L. NOLAN, P.; P. NORRIS, J.; NOUTSOS, A.; NUSS, E.; OHSUGI, T.; OMODEI, N.; ORLANDO, E.; F. ORMES, J.; PANEQUE, D.; PARENT, D.; PELASSA, V.; PEPE, M.; PESCE-ROLLINS, M.; PIRON, F.; PORTER, T.A.; RAINÒ, S.; RANDO, R.; RAZZANO, M.; REIMER, A.; REIMER, O.; REPOSEUR, T.; S. ROCHESTER, L.; Y. RODRIGUEZ, A.; W. ROMANI, R.; ROTH, M.; RYDE, F.; F.-W. SADROZINSKI, H.; SANCHEZ, D.; SANDER, A.; M. SAZ PARKINSON, P.; D. SCARGLE, J.; SGRÒ, C.; J. SISKIND, E.; SMITH, David Stanley; D. SMITH, P.; SPANDRE, G.; SPINELLI, P.; W. STAPPERS, B.; W. STECKER, F.; S. STRICKMAN, M.; J. SUSON, D.; TAJIMA, H.; H. TAKAHASHI, ‡; TAKAHASHI, T.; TANAKA, T.; THAYER, J.B.; G. THAYER, J.; THEUREAU, Gilles; J. THOMPSON, D.; TIBALDO, L.; TIBOLLA, O.; F. TORRES, D.; TOSTI, G.; TRAMACERE, A.; UCHIYAMA, Y.; USHER, T.L.; VASILEIOU, V.; VENTER, C.; VILCHEZ, N.; VITALE, V.; P. WAITE, A.; WANG, P.; L. WINER, B.; S. WOOD, K.; YAMAZAKI, R.; YLINEN, T.; ZIEGLER, M.

doi:10.1126/science.1182787

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Science. 2010-02-26, vol. 327, p. 1103-1106

American Association for the Advancement of Science (AAAS)

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Recent observations of supernova remnants (SNRs) hint that they accelerate cosmic rays to energies close to ~1015 electron volts. However, the nature of the particles that produce the emission remains ambiguous. We report observations of SNR W44 with the Fermi Large Area Telescope at energies between 2 × 108 electron volts and 3 × 1011 electron volts. The detection of a source with a morphology corresponding to the SNR shell implies that the emission is produced by particles accelerated there. The gamma-ray spectrum is well modeled with emission from protons and nuclei. Its steepening above ~109 electron volts provides a probe with which to study how particle acceleration responds to environmental effects such as shock propagation in dense clouds and how accelerated particles are released into interstellar space.< Réduire

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Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT

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