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

被引：92
作者：
Abdo, A. A. [1 ,2 ]
Ackermann, M. [3 ,4 ]
Ajello, M. [3 ,4 ]
Baldini, L. [5 ]
Ballet, J. [6 ]
Barbiellini, G. [7 ,8 ]
Bastieri, D. [9 ,10 ]
Bechtol, K. [3 ,4 ]
Bellazzini, R. [5 ]
Bloom, E. D. [3 ,4 ]
Bonamente, E. [11 ,12 ]
Borgland, A. W. [3 ,4 ]
Bouvier, A. [3 ,4 ]
Bregeon, J. [5 ]
Brez, A. [5 ]
Brigida, M. [13 ,14 ]
Bruel, P. [15 ]
Buehler, R. [3 ,4 ]
Buson, S. [9 ,10 ]
Caliandro, G. A. [16 ]
Cameron, R. A. [3 ,4 ]
Caraveo, P. A. [17 ]
Casandjian, J. M. [6 ]
Cecchi, C. [11 ,12 ]
Celik, Oe [18 ,19 ,20 ,21 ]
Cheung, C. C. [1 ,2 ]
Chiang, J. [3 ,4 ]
Ciprini, S. [12 ]
Claus, R. [3 ,4 ]
Cohen-Tanugi, J. [22 ]
Conrad, J. [23 ,24 ]
Dermer, C. D. [1 ]
de Palma, F. [13 ,14 ]
Digel, S. W. [3 ,4 ]
do Couto e Silva, E. [3 ,4 ]
Drell, P. S. [3 ,4 ]
Dumora, D. [25 ,26 ]
Favuzzi, C. [13 ,14 ]
Funk, S. [3 ,4 ]
Fusco, P. [13 ,14 ]
Gargano, F. [14 ]
Gehrels, N. [18 ]
Giglietto, N. [13 ,14 ]
Giordano, F. [13 ,14 ]
Giroletti, M. [27 ]
Glanzman, T. [3 ,4 ]
Godfrey, G. [3 ,4 ]
Grenier, I. A. [6 ]
Grondin, M-H. [25 ,26 ]
Grove, J. E. [1 ]
机构：
[1] USN, Res Lab, Div Space Sci, Washington, DC 20375 USA
[2] Natl Acad Sci, Natl Res Council Res Associate, Washington, DC 20001 USA
[3] Stanford Univ, WW Hansen Expt Phys Lab, Kavli Inst Particle Astrophys & Cosmol, Dept Phys, Stanford, CA 94305 USA
[4] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA
[5] Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy
[6] Univ Paris Diderot, Lab AIM, CEA IRFU, CNRS,CEA Saclay, F-91191 Gif Sur Yvette, France
[7] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy
[8] Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy
[9] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
[10] Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy
[11] Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy
[12] Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy
[13] Univ & Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy
[14] Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy
[15] Ecole Polytech, CNRS, Lab Leprince Ringuet, IN2P3, F-91128 Palaiseau, France
[16] CSIC, IEEC, Inst Ciencies Espai, Barcelona 08193, Spain
[17] INAF Ist Astrofis Spaziale & Fis Cosm, I-20133 Milan, Italy
[18] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[19] CRESST, Greenbelt, MD 20771 USA
[20] Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA
[21] Univ Maryland Baltimore Cty, Ctr Space Sci & Technol, Baltimore, MD 21250 USA
[22] Univ Montpellier 2, Lab Phys Theor & Astroparticules, CNRS, IN2P3, Montpellier, France
[23] Stockholm Univ, Dept Phys, SE-10691 Stockholm, Sweden
[24] Oskar Klein Ctr Cosmoparticle Phys, SE-10691 Stockholm, Sweden
[25] Ctr Etud Nucl Bordeaux Gradignan, CNRS, IN2P3, UMR 5797, F-33175 Gradignan, France
[26] Univ Bordeaux, UMR 5797, Ctr Etud Nucl Bordeaux Gradignan, F-33175 Gradignan, France
[27] INAF Ist Radioastron, I-40129 Bologna, Italy
[28] Max Planck Inst Radioastron, D-53121 Bonn, Germany
[29] Univ Alabama, CSPAR, Huntsville, AL 35899 USA
[30] ICREA, Barcelona, Spain
[31] Hiroshima Univ, Dept Phys Sci, Hiroshima 7398526, Japan
[32] Ohio State Univ, Dept Phys, Ctr Cosmol & Astroparticle Phys, Columbus, OH 43210 USA
[33] Royal Inst Technol KTH, Dept Phys, SE-10691 Stockholm, Sweden
[34] Waseda Univ, Res Inst Sci & Engn, Shinjuku Ku, Tokyo 1698555, Japan
[35] JAXA, Inst Space & Astronaut Sci, Kanagawa 2298510, Japan
[36] Univ Tokyo, Dept Phys, Grad Sch Sci, Bunkyo Ku, Tokyo 1130033, Japan
[37] UPS, CNRS, Ctr Etud Spatiale Rayonnements, F-31028 Toulouse 4, France
[38] George Mason Univ, Fairfax, VA 22030 USA
[39] Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy
[40] Univ Denver, Dept Phys & Astron, Denver, CO 80208 USA
[41] Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Hiroshima 7398526, Japan
[42] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany
[43] Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria
[44] Leopold Franzens Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria
[45] Univ Washington, Dept Phys, Seattle, WA 98195 USA
[46] Univ Calif Santa Cruz, Santa Cruz Inst Particle Phys, Dept Phys, Santa Cruz, CA 95064 USA
[47] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
[48] NYCB Real Time Comp Inc, Lattingtown, NY 11560 USA
[49] Purdue Univ Calumet, Dept Chem & Phys, Hammond, IN 46323 USA
[50] Univ Wurzburg, Inst Theoret Phys & Astrophys, D-97074 Wurzburg, Germany
来源：
ASTROPHYSICAL JOURNAL | 2010年 / 722卷 / 02期
关键词：
acceleration of particles; ISM: individual objects (W49B); radiation mechanisms: non-thermal; LARGE-AREA TELESCOPE; X-RAY; PARTICLE-ACCELERATION; RX J1713.7-3946; COSMIC-RAYS; CATALOG; RADIO; DISCOVERY; PULSARS; ORIGIN;
D O I：
10.1088/0004-637X/722/2/1303
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
引用
收藏
页码：1303 / 1311
页数：9
相关论文
共 29 条
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