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; 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; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; J. M. Casandjian; C. Cecchi; Ö. Çelik; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; C. D. Dermer; F. de Palma; S. W. Digel; E. Do Couto E Silva; P. S. Drell; D. Dumora; C. Favuzzi; S. Funk; P. Fusco; F. Gargano; N. Gehrels; N. Giglietto; F. Giordano; M. Giroletti; T. Glanzman; G. Godfrey; I. A. Grenier; M.-H. Grondin; J. E. Grove; L. Guillemot; S. Guiriec; D. Hadasch; Y. Hanabata; A. K. Harding; M. Hayashida; E. Hays; D. Horan; R. E. Hughes; M. S. Jackson; G. Jóhannesson; A. S. Johnson; W. N. Johnson; T. Kamae; H. Katagiri; J. Kataoka; J. Katsuta; Jürgen Knödlseder; M. Kuss; J. Lande; L. Latronico; S.-H. Lee; M. Lemoine-Goumard; 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; P. L. Nolan; J. P. Norris; E. Nuss; T. Ohsugi; A. Okumura; N. Omodei; E. Orlando; J. F. Ormes; V. Pelassa; M. Pepe; M. Pesce-Rollins; F. Piron; S. Rainò; R. Rando; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; J. Ripken; M. Roth; H. F.-W. Sadrozinski; A. Sander; P. M. Saz Parkinson; C. Sgrò; E. J. Siskind; David Stanley Smith; P. D. Smith; P. Spinelli; M. S. Strickman; D. J. Suson; H. Tajima; H. Takahashi; T. Takahashi; T. Tanaka; L. Tibaldo; 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

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

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

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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, Guido Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, E. D. Bloom, …

The Astrophysical Journal, Vol.722, pp.1303-1311

20/10/2010

DOI: https://doi.org/10.1088/0004-637X/722/2/1303

Abstract

acceleration of particles

ISM: individual objects (W49B)

radiation mechanisms: non-thermal

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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Title: Fermi-LAT Study of Gamma-ray Emission in the Direction of Supernova Remnant W49B
Creators - without role: A.A. Abdo - National Academy of Sciences
Markus Ackermann - Kavli Institute for Particle Astrophysics and Cosmology
Marco Ajello - Kavli Institute for Particle Astrophysics and Cosmology
Luca Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Jean Ballet - Astrophysique, Instrumentation et Modélisation
Guido Barbiellini - University of Trieste
D. Bastieri - University of Padua
K. Bechtol - Kavli Institute for Particle Astrophysics and Cosmology
R. Bellazzini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. D. Bloom
E. Bonamente - University of Perugia
A. W. Borgland
A. Bouvier - Kavli Institute for Particle Astrophysics and Cosmology
J. Bregeon - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Brez - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
M. Brigida - Polytechnic University of Bari
Pascal Bruel - École Polytechnique
R. Buehler - Kavli Institute for Particle Astrophysics and Cosmology
S. Buson - University of Padua
G. A. Caliandro
R. A. Cameron
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
J. M. Casandjian - Astrophysique Interprétation Modélisation
C. Cecchi - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
Ö. Çelik - Goddard Space Flight Center
C. C. Cheung
J. Chiang - Kavli Institute for Particle Astrophysics and Cosmology
S. Ciprini - University of Perugia
R. Claus - Kavli Institute for Particle Astrophysics and Cosmology
J. Cohen-Tanugi - Laboratoire de Physique Théorique
J. Conrad - Stockholm University
C. D. Dermer
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
S. W. Digel
E. Do Couto E Silva
P. S. Drell
D. Dumora - Laboratoire de Physique des deux infinis Bordeaux
C. Favuzzi - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
S. Funk - Kavli Institute for Particle Astrophysics and Cosmology
P. Fusco - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
N. Gehrels - Goddard Space Flight Center
N. Giglietto - Polytechnic University of Bari
F. Giordano - Polytechnic University of Bari
M. Giroletti - Istituto di Radioastronomia di Bologna
T. Glanzman - Kavli Institute for Particle Astrophysics and Cosmology
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
I. A. Grenier - Astrophysique Interprétation Modélisation
M.-H. Grondin - Laboratoire de Physique des deux infinis Bordeaux
J. E. Grove
L. Guillemot - Max Planck Institute for Radio Astronomy
S. Guiriec - University of Alabama in Huntsville
D. Hadasch - Institució Catalana de Recerca i Estudis Avançats
Y. Hanabata - Hiroshima University
A. K. Harding
M. Hayashida - Kavli Institute for Particle Astrophysics and Cosmology
E. Hays - Goddard Space Flight Center
D. Horan - Laboratoire Leprince-Ringuet
R. E. Hughes
M. S. Jackson
G. Jóhannesson - Kavli Institute for Particle Astrophysics and Cosmology
A. S. Johnson
W. N. Johnson
T. Kamae - Kavli Institute for Particle Astrophysics and Cosmology
H. Katagiri - Hiroshima University
J. Kataoka - Waseda University
J. Katsuta - Institute of Space and Astronautical Science
Jürgen Knödlseder - Centre National d'Études Spatiales
M. Kuss - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
J. Lande - Kavli Institute for Particle Astrophysics and Cosmology
L. Latronico - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
S.-H. Lee - Kavli Institute for Particle Astrophysics and Cosmology
M. Lemoine-Goumard - Laboratoire de Physique des deux infinis Bordeaux
F. Longo - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. Loparco - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
M. N. Lovellette
P. Lubrano - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
A. Makeev - United States Naval Research Laboratory
M. N. Mazziotta
T. Mizuno - Hiroshima University
C. Monte - Polytechnic University of Bari
M. E. Monzani
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I. V. Moskalenko
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
M. Naumann-Godo - CEA Paris-Saclay
P. L. Nolan
J. P. Norris
E. Nuss - Laboratoire de Physique Théorique
T. Ohsugi - Hiroshima University
A. Okumura - Institute of Space and Astronautical Science
N. Omodei - Kavli Institute for Particle Astrophysics and Cosmology
E. Orlando - Max Planck Institute for Extraterrestrial Physics
J. F. Ormes
V. Pelassa - Institut National de Physique Nucléaire et de Physique des Particules
M. Pepe - University of Perugia
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
F. Piron - Laboratoire de Physique Théorique
S. Rainò - Polytechnic University of Bari
R. Rando - University of Padua
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Reimer - SLAC National Accelerator Laboratory
O. Reimer - Stanford University
T. Reposeur - Laboratoire de Physique des deux infinis Bordeaux
J. Ripken - AlbaNova
M. Roth - University of Washington
H. F.-W. Sadrozinski
A. Sander - The Ohio State University
P. M. Saz Parkinson
C. Sgrò - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. J. Siskind
David Stanley Smith - Laboratoire de Physique des deux infinis Bordeaux
P. D. Smith
P. Spinelli - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
M. S. Strickman
D. J. Suson
H. Tajima - Stanford University
H. Takahashi - Hiroshima University
T. Takahashi - Institute of Space and Astronautical Science
T. Tanaka - Kavli Institute for Particle Astrophysics and Cosmology
L. Tibaldo - University of Padua
O. Tibolla - University of Würzburg
D. F. Torres
G. Tosti - University of Perugia
A. Tramacere - Kavli Institute for Particle Astrophysics and Cosmology
Y. Uchiyama - Kavli Institute for Particle Astrophysics and Cosmology
T. L. Usher
J. Vandenbroucke - Kavli Institute for Particle Astrophysics and Cosmology
V. Vasileiou - Goddard Space Flight Center
V. Vitale - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
A. P. Waite
P. Wang - SLAC National Accelerator Laboratory
B. L. Winer
K. S. Wood
T. Ylinen - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Ziegler - University of California, Santa Cruz
Publication Details: The Astrophysical Journal, Vol.722, pp.1303-1311
Identifiers: 9934271209311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00584255