A. ABDO, A.; ACKERMANN, Markus; AJELLO, Marco; ALLAFORT, A.; 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; BUEHLER, R.; H. BURNETT, T.; BUSETTO, G.; A. CALIANDRO, G.; A. CAMERON, R.; CARAVEO, P. A.; M. CASANDJIAN, J.; CECCHI, C.; ÇELIK, Ö.; CHARLES, E.; CHATY, S.; CHEKHTMAN, A.; C. CHEUNG, C.; CHIANG, J.; N. CILLIS, A.; CIPRINI, S.; CLAUS, R.; COHEN-TANUGI, J.; CONRAD, J.; CORBEL, S.; DE PALMA, F.; W. DIGEL, S.; DORMODY, M.; DO COUTO E SILVA, E.; S. DRELL, P.; DUBOIS, R.; DUMORA, D.; EDMONDS, Y.; FARNIER, C.; FAVUZZI, C.; J. FEGAN, S.; C. FERRARA, E.; B. FOCKE, W.; FORTIN, P.; FRAILIS, M.; FUKAZAWA, Y.; FUNK, S.; FUSCO, P.; GARGANO, F.; GASPARRINI, D.; GEHRELS, N.; GERMANI, S.; GIAVITTO, G.; GIGLIETTO, N.; GIORDANO, F.; GLANZMAN, T.; GODFREY, G.; A. GRENIER, I.; GRONDIN, M.-H.; E. GROVE, J.; GUILLEMOT, L.; GUIRIEC, S.; HANABATA, Y.; HAYS, E.; K. HARDING, A.; HAYASHIDA, M.; HORAN, D.; E. HUGHES, R.; S. JACKSON, M.; S. JOHNSON, A.; J. JOHNSON, T.; N. JOHNSON, W.; KAMAE, T.; KATAGIRI, H.; KATAOKA, J.; KAWAI, N.; KERR, M.; KNÖDLSEDER, Jürgen; KUSS, M.; LANDE, J.; LATRONICO, L.; LEMOINE-GOUMARD, M.; LONGO, F.; LOPARCO, F.; LOTT, B.; N. LOVELLETTE, M.; LUBRANO, P.; MAKEEV, A.; N. MAZZIOTTA, M.; 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.; NUSS, E.; OHSUGI, T.; OKUMURA, A.; OMODEI, N.; ORLANDO, E.; F. ORMES, J.; PANEQUE, D.; H. PANETTA, J.; PELASSA, V.; PEPE, M.; PESCE-ROLLINS, M.; PIRON, F.; POHL, M.; PORTER, T.A.; RAINÒ, S.; RANDO, R.; REIMER, A.; REIMER, O.; REPOSEUR, T.; RITZ, S.; Y. RODRIGUEZ, A.; W. ROMANI, R.; ROTH, M.; F.-W. SADROZINSKI, H.; SANDER, A.; M. SAZ PARKINSON, P.; D. SCARGLE, J.; SGRÒ, C.; J. SISKIND, E.; SMITH, David Stanley; D. SMITH, P.; SPINELLI, P.; S. STRICKMAN, M.; J. SUSON, D.; TAJIMA, H.; TAKAHASHI, T.; TANAKA, T.; B. THAYER, J.; G. THAYER, J.; J. THOMPSON, D.; E. THORSETT, S.; TIBALDO, L.; TIBOLLA, O.; F. TORRES, D.; TOSTI, G.; TRAMACERE, A.; UCHIYAMA, Y.; L. USHER, T.; VAN ETTEN, A.; 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:10.1088/2041-8205/710/1/L92

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The Astrophysical journal letters. 2010-02-10, vol. 710, p. L92-L97

Bristol : IOP Publishing

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We report on the first detection of GeV high-energy gamma-ray emission from a young supernova remnant with the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope. These observations reveal a source with no discernible spatial extension detected at a significance level of 12.2$\sigma$ above 500 MeV at a location that is consistent with the position of the remnant of the supernova explosion that occurred around 1680 in the Cassiopeia constellation - Cassiopeia A. The gamma-ray flux and spectral shape of the source are consistent with a scenario in which the gamma-ray emission originates from relativistic particles accelerated in the shell of this remnant. The total content of cosmic rays (electrons and protons) accelerated in Cas A can be estimated as $W_{\mathrm{CR}} \approx (1-4) \times 10^{49}$ erg thanks to the well-known density in the remnant assuming that the observed gamma-ray originates in the SNR shell(s). The magnetic field in the radio-emitting plasma can be robustly constrained as B $\gt 0.1$ mG, providing new evidence of the magnetic field amplification at the forward shock and the strong field in the shocked ejecta.< Réduire

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acceleration of particles

ISM: individual objects (Cassiopeia A)

radiation mechanisms: non-thermal

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Fermi-LAT discovery of GeV gamma-ray emission from the young supernova remnant Cassiopeia A

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