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Ajello, M; Baldini, L; Ballet, J; Baughman, B. M; Bechtol, K; Blandford, R. D; Bonamente, E; Borgland, A. W; Bregeon, J; Brez, A; Brigida, M; Buehler, R; Burnett, T. H; Busetto, G; Caliandro, G. A; Cameron, R. A; Caraveo, P. A; Casandjian, J. M; Cecchi, C; Çelik, Ö; Chekhtman, A; Cheung, C. C; Cillis, A. N; Cohen-Tanugi, J; Conrad, J; Corbel, S; de Palma, F; do Couto e Silva, E; Dubois, R; Dumora, D; Favuzzi, C; Fegan, S. J; Ferrara, E. C; Fortin, P; Frailis, M; Fukazawa, Y; Funk, S; Gasparrini, D; Giglietto, N; Glanzman, T; Grenier, I. A; Grondin, M.-H; Hanabata, Y; Harding, A. K; Hayashida, M; Horan, D; Hughes, R. E; Johnson, A. S; Johnson, T. J; Kamae, T; Katagiri, H; Kerr, M; Kuss, M; Latronico, L; Lemoine-Goumard, M; Lubrano, P; Makeev, A; Mazziotta, M. N; Mitthumsiri, W; Mizuno, T; Morselli, A; Murgia, S; Nakamori, T; Nolan, P. L; Norris, J. P; Okumura, A; Omodei, N; Pepe, M; Piron, F; Pohl, M; Porter, T. A; Rainò, S; Reimer, A; Reposeur, T; Rodriguez, A. Y; Romani, R. W; Roth, M; Sadrozinski, H. F.-W; Siskind, E. J; Spinelli, P; Suson, D. J; Tajima, H; Takahashi, T; Thayer, J. B; Thompson, D. J; Tibaldo, L; Tibolla, O; Uchiyama, Y; Usher, T. L; Van Etten, A; Vasileiou, V; Venter, C; Vitale, V; Waite, A. P; Wang, P; Winer, B. L; Wood, K. S; Yamazaki, R; Ylinen, T; Ziegler, M
Astrophysical journal. Letters, 02/2010, Letnik: 710, Številka: 1Journal Article
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.
