FERMI-LAT STUDY OF GAMMA-RAY EMISSION IN THE DIRECTION OF SUPERNOVA REMNANT W49B

Abdo AA, Ackermann M, Ajello M, Baldini L, Ballet J, Barbiellini G, Bastieri D, Bechtol K, Bellazzini R, Bloom ED, Bonamente E, Borgland AW, Bouvier A, Bregeon J, Brez A, Brigida M, Bruel P, Buehler R, Buson S, Caliandro GA, Cameron RA, Caraveo PA, Casandjian JM, Cecchi C, Celik O, Cheung CC, Chiang J, Ciprini S, Claus R, Cohen-Tanugi J, Conrad J, Dermer CD, De Palma F, Digel SW, Do Couto E Silva E, Drell PS, Dumora D, Favuzzi C, Funk S, Fusco P, Gargano F, Gehrels N, Giglietto N, Giordano F, Giroletti M, Glanzman T, Godfrey G, Grenier IA, Grondin MH, Grove JE, Guillemot L, Guiriec S, Hadasch D, Hanabata Y, Harding AK, Hayashida M, Hays E, Horan D, Hughes RE, Jackson MS, Johannesson G, Johnson AS, Johnson WN, Kamae T, Katagiri H, Kataoka J, Katsuta J, Knoedlseder J, Kuss MW, Lande J, Latronico L, Lee SH, Lemoine-Goumard M, Longo F, Loparco F, Lovellette MN, Lubrano P, Makeev A, Mazziotta MN, Mizuno T, Monte C, Monzani ME, Morselli A, Moskalenko IV, Murgia S, Naumann-Godo M, Nolan PL, Norris JP, Nuss E, Ohsugi T, Okumura A, Omodei N, Orlando E, Ormes JF, Pelassa V, Pepe M, Pesce-Rollins M, Piron F, Raino S, Rando R, Razzano M, Reimer A, Reimer O, Reposeur T, Ripken J, Roth M, Sadrozinski HF, Sander A, Parkinson PMS, Sgro C, Siskind EJ, Smith DA, Smith PD, Spinelli P, Strickman MS, Suson DJ, Tajima H, Takahashi HH, Takahashi T, Tanaka T, Tibaldo L, Tibolla O, Torres DF, Tosti G, Tramacere A, Uchiyama Y, Usher TL, Vandenbroucke J, Vasileiou V, Vitale V, Waite AP, Wang P, Winer BL, Wood KS, Ylinen T, Ziegler M (2010)

Publication Type: Journal article

Publication year: 2010

Journal

Book Volume: 722

Pages Range: 1303-1311

Journal Issue: 2

DOI: 10.1088/0004-637X/722/2/1303

Abstract

We present an analysis of the gamma-ray data obtained with the Large Area Telescope (LAT) on board 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 1.5 x 10(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 supernova remnant (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,U-p > 10(4) eV cm(-3), for either gamma-ray production mechanism.

Authors with CRIS profile

Involved external institutions

U.S. Naval Research Laboratory United States (USA) (US) Stanford University United States (USA) (US) National Institute for Nuclear Physics / Istituto Nazionale di Fisica Nucleare (INFN) Italy (IT) University of Paris 7 - Denis Diderot / Université Paris VII Denis Diderot France (FR) University of Bari Aldo Moro / Università degli Studi di Bari Aldo Moro Italy (IT) École Polytechnique - Université Paris-Saclay France (FR) Spanish National Research Council / Consejo Superior de Investigaciones Científicas (CSIC) Spain (ES) National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF) Italy (IT) National Aeronautics and Space Administration (NASA) United States (USA) (US) Università degli Studi di Perugia Italy (IT) University of Montpellier / Université Montpellier France (FR) Stockholm University / Stockholms universitet Sweden (SE) Centre d'Etudes Nucléaires de Bordeaux-Gradignan (CENBG) France (FR) University of Alabama in Huntsville (UAH) United States (USA) (US) Institució Catalana de Recerca i Estudis Avançats (ICREA) / Catalan Institution for Research and Advanced Studies Spain (ES) Ohio State University United States (USA) (US) AlbaNova University Centre / Kungliga Tekniska Högskolan AlbaNova Universitetscentrum Sweden (SE) Hiroshima University / 広島大学 Japan (JP) University of Washington United States (USA) (US) University of California Santa Cruz United States (USA) (US) NYCB Real-Time Computing, Inc. United States (USA) (US) Waseda University / 早稲田大学 Japan (JP) Japan Aerospace eXploration Agency (JAXA) Japan (JP) Université Toulouse III - Paul Sabatier France (FR) University of Denver United States (USA) (US) Max-Planck-Institut für extraterrestrische Physik (MPE) / Max Planck Institute for Extraterrestrial Physics Germany (DE) Purdue University Northwest / Purdue University Calumet United States (USA) (US) Julius-Maximilians-Universität Würzburg Germany (DE)

How to cite

APA:

Abdo, A.A., Ackermann, M., Ajello, M., Baldini, L., Ballet, J., Barbiellini, G.,... Ziegler, M. (2010). FERMI-LAT STUDY OF GAMMA-RAY EMISSION IN THE DIRECTION OF SUPERNOVA REMNANT W49B. Astrophysical Journal, 722(2), 1303-1311. https://doi.org/10.1088/0004-637X/722/2/1303

MLA:

Abdo, A. A., et al. "FERMI-LAT STUDY OF GAMMA-RAY EMISSION IN THE DIRECTION OF SUPERNOVA REMNANT W49B." Astrophysical Journal 722.2 (2010): 1303-1311.

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