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

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Authors
Abdo, A.
Ackermann, M.
Ajello, M.
Baldini, L.
Ballet, J.
Barbiellini, G.
Baring, M.
Bastieri, D.
Baughman, B.
Bechtol, K.
Bellazzini, R.
Berenji, B.
Blandford, R.
Bloom, E.
Bonamente, E.
Borgland, A.
Bregeon, J.
Brez, A.
Brigida, M.
Bruel, P.
Burnett, T.
Buson, S.
Caliandro, G.
Cameron, R.
Caraveo, P.
Casandjian, J.
Cecchi, C.
Celik, O.
Chekhtman, A.
Cheung, C.
Chiang, J.
Ciprini, S.
Claus, R.
Cognard, I.
Cohen-Tanugi, J.
Cominsky, L.
Conrad, J.
Cutini, S.
Dermer, C.
de Angelis, A.
de Palma, F.
Digel, S.
Do Couto e Silva, E.
Drell, P.
Dubois, R.
Dumora, D.
Espinoza, C.
Farmer, C.
Favuzzi, C.
Fegan, S.
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.
Grenier, I.
Grondin, M.
Grove, J.
Guillemot, L.
Guiriec, S.
Hanabata, Y.
Harding, A.
Hayashida, M.
Hays, E.
Hughes, R.
Jackson, M.
Johannesson, G.
Johnson, A.
Johnson, T.
Johnson, W.
Kamae, T.
Katagiri, H.
Kataoka, J.
Katsuta, J.
Kawai, N.
Kerr, M.
Knödlseder, J.
Kocian, M.
Kramer, M.
Kuss, M.
Lande, J.
Latronico, L.
Lemoine-Goumard, M.
Longo, F.
Loparco, F.
Lott, B.
Lovellette, M.
Lubrano, P.
Lyne, A.
Madejski, G.
Makeev, A.
Mazziotta, M.
McEnery, J.
Meurer, C.
Michelson, P.
Mitthumsiri, W.
Mizuno, T.
Monte, C.
Monzani, M.
Morselli, A.
Moskalenko, I.
Murgia, S.
Nakamori, T.
Nolan, P.
Noms, J.
Noutsos, A.
Nuss, E.
Ohsugi, T.
Omodei, N.
Orlando, E.
Ormes, J.
Paneque, D.
Parent, D.
Pelassa, V.
Pepe, M.
Pesce-Rollins, M.
Piron, F.
Porter, T.
Raino, S.
Rando, R.
Razzano, M.
Reimer, A.
Reimer, O.
Reposeur, T.
Rodriguez, A.
Romani, R.
Roth, M.
Ryde, F.
Sadrozinski, H.
Sanchez, D.
Sander, A.
Saz Parkinson, P.
Scargle, J.
Sgro, C.
Siskind, E.
Smith, D.
Smith, P.
Spandre, G.
Spinelli, P.
Stappers, B.
Stecker, F.
Strikman, M.
Suson, D.
Tajima, H.
Takahashi, H.
Takahashi, T.
Tanaka, T.
Thayer, J.
Thayer, J.
Theureau, G.
Thompson, D.
Tibaldo, L.
Tibolla, Omar
Torres, D.
Tosti, G.
Tramacere, A.
Uchiyama, Y.
Usher, T.
Vasileiou, V.
Venter, C.
Vilchez, N.
Vitale, V.
Waite, A.
Wang, P.
Winer, B.
Wood, K.
Yamazaki, R.
Ylinen, T.
Ziegler, M.
Date
2010
Type
Journal Article

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Citation
Abdo, A. and Ackermann, M. and Ajello, M. and Baldini, L. and Ballet, J. and Barbiellini, G. and Baring, M. et al. 2010. Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT. Science. 327 (5969): pp. 1103-1106.
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Science
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Abstract

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.