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Fermi-LAT Study of Gamma-ray Emission in the Direction of Supernova Remnant W49B

A.A. Abdo Markus Ackermann Marco Ajello Luca Baldini Jean Ballet 1 Guido Barbiellini D. Bastieri K. Bechtol R. Bellazzini E. D. Bloom E. Bonamente A. W. Borgland A. Bouvier J. Bregeon A. Brez M. Brigida Pascal Bruel 2 R. Buehler S. Buson G. A. Caliandro R. A. Cameron P. A. Caraveo J. M. Casandjian 1 C. Cecchi Ö. Çelik C. C. Cheung J. Chiang S. Ciprini R. Claus J. Cohen-Tanugi 3 J. Conrad C. D. Dermer F. de Palma S. W. Digel E. Do Couto E Silva P. S. Drell D. Dumora 4 C. Favuzzi S. Funk P. Fusco F. Gargano N. Gehrels N. Giglietto F. Giordano M. Giroletti T. Glanzman G. Godfrey I. A. Grenier 1 M.-H. Grondin 4 J. E. Grove L. Guillemot 4 S. Guiriec D. Hadasch Y. Hanabata A. K. Harding M. Hayashida E. Hays D. Horan 2 R. E. Hughes M. S. Jackson G. Jóhannesson A. S. Johnson W. N. Johnson T. Kamae H. Katagiri J. Kataoka J. Katsuta J. Knödlseder 5 M. Kuss J. Lande L. Latronico S.-H. Lee M. Lemoine-Goumard 4 F. Longo F. Loparco M. N. Lovellette P. Lubrano A. Makeev M. N. Mazziotta T. Mizuno C. Monte M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia M. Naumann-Godo 1 P. L. Nolan J. P. Norris E. Nuss 3 T. Ohsugi A. Okumura N. Omodei E. Orlando J. F. Ormes V. Pelassa 3 M. Pepe M. Pesce-Rollins F. Piron 3 S. Rainò R. Rando M. Razzano A. Reimer O. Reimer T. Reposeur 4 J. Ripken M. Roth H. F.-W. Sadrozinski A. Sander P. M. Saz Parkinson C. Sgrò E. J. Siskind David Stanley Smith 4 P. D. Smith P. Spinelli M. S. Strickman D. J. Suson H. Tajima H. Takahashi T. Takahashi T. Tanaka L. Tibaldo 1 O. Tibolla D. F. Torres G. Tosti A. Tramacere Y. Uchiyama T. L. Usher J. Vandenbroucke V. Vasileiou V. Vitale A. P. Waite P. Wang B. L. Winer K. S. Wood T. Ylinen M. Ziegler
Abstract : We present an analysis of the gamma-ray data obtained with the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope in the direction of SNR W49B (G43.3-0.2). A bright unresolved gamma-ray source detected at a significance of 38 sigma is found to coincide with SNR W49B. The energy spectrum in the 0.2-200 GeV range gradually steepens toward high energies. The luminosity is estimated to be 1.5x10^{36} (D/8 kpc)^2 erg s^-1 in this energy range. There is no indication that the gamma-ray emission comes from a pulsar. Assuming that the SNR shell is the site of gamma-ray production, the observed spectrum can be explained either by the decay of neutral pi mesons produced through the proton-proton collisions or by electron bremsstrahlung. The calculated energy density of relativistic particles responsible for the LAT flux is estimated to be remarkably large, U_{e,p}>10^4 eV cm^-3, for either gamma-ray production mechanism.
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A.A. Abdo, Markus Ackermann, Marco Ajello, Luca Baldini, Jean Ballet, et al.. Fermi-LAT Study of Gamma-ray Emission in the Direction of Supernova Remnant W49B. The Astrophysical Journal, American Astronomical Society, 2010, 722, pp.1303-1311. ⟨10.1088/0004-637X/722/2/1303⟩. ⟨in2p3-00584255⟩

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