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. 2010 Feb 26;327(5969):1103-6.
doi: 10.1126/science.1182787. Epub 2010 Jan 7.

Gamma-ray emission from the shell of supernova remnant W44 revealed by the Fermi LAT

A A Abdo  1 , M Ackermann, M Ajello, L Baldini, J Ballet, G Barbiellini, M G Baring, D Bastieri, B M Baughman, K Bechtol, R Bellazzini, B Berenji, R D Blandford, E D Bloom, E Bonamente, A W Borgland, J Bregeon, A Brez, M Brigida, P Bruel, T H Burnett, S Buson, G A Caliandro, R A Cameron, P A Caraveo, J M Casandjian, C Cecchi, O Celik, A Chekhtman, C C Cheung, J Chiang, S Ciprini, R Claus, I Cognard, J Cohen-Tanugi, L R Cominsky, J Conrad, S Cutini, C D Dermer, A de Angelis, F de Palma, S W Digel, E do Couto e Silva, P S Drell, R Dubois, D Dumora, C Espinoza, C Farnier, C Favuzzi, S J Fegan, W B Focke, P Fortin, M Frailis, Y Fukazawa, S Funk, P Fusco, F Gargano, D Gasparrini, N Gehrels, S Germani, G Giavitto, B Giebels, N Giglietto, F Giordano, T Glanzman, G Godfrey, I A Grenier, M-H Grondin, J E Grove, L Guillemot, S Guiriec, Y Hanabata, A K Harding, M Hayashida, E Hays, R E Hughes, M S Jackson, G Jóhannesson, A S Johnson, T J Johnson, W N Johnson, T Kamae, H Katagiri, J Kataoka, J Katsuta, N Kawai, M Kerr, J Knödlseder, M L Kocian, M Kramer, M Kuss, J Lande, L Latronico, M Lemoine-Goumard, F Longo, F Loparco, B Lott, M N Lovellette, P Lubrano, A G Lyne, G M Madejski, A Makeev, M N Mazziotta, J E McEnery, C Meurer, P F Michelson, W Mitthumsiri, T Mizuno, C Monte, M E Monzani, A Morselli, I V Moskalenko, S Murgia, T Nakamori, P L Nolan, J P Norris, A Noutsos, E Nuss, T Ohsugi, N Omodei, E Orlando, J F Ormes, D Paneque, D Parent, V Pelassa, M Pepe, M Pesce-Rollins, F Piron, T A Porter, S Rainò, R Rando, M Razzano, A Reimer, O Reimer, T Reposeur, L S Rochester, A Y Rodriguez, R W Romani, M Roth, F Ryde, H F-W Sadrozinski, D Sanchez, A Sander, P M Saz Parkinson, J D Scargle, C Sgrò, E J Siskind, D A Smith, P D Smith, G Spandre, P Spinelli, B W Stappers, F W Stecker, M S Strickman, D J Suson, H Tajima, H Takahashi, T Takahashi, T Tanaka, J B Thayer, J G Thayer, G Theureau, D J Thompson, L Tibaldo, O Tibolla, D F Torres, G Tosti, A Tramacere, Y Uchiyama, T L Usher, V Vasileiou, C Venter, N Vilchez, V Vitale, A P Waite, P Wang, B L Winer, K S Wood, R Yamazaki, T Ylinen, M Ziegler
Affiliations

Gamma-ray emission from the shell of supernova remnant W44 revealed by the Fermi LAT

A A Abdo et al. Science. .

Abstract

Recent observations of supernova remnants (SNRs) hint that they accelerate cosmic rays to energies close to ~10(15) 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 x 10(8) electron volts and 3 x10(11) 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 approximately 10(9) 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.

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