Fermi LAT Observations of the Supernova Remnant W28 (G6.4-0.1)

A. A. Abdo; M. Ackermann; M. Ajello; A. Allafort; L. Baldini; Jean Ballet; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; B. Berenji; R. D. Blandford; E. D. Bloom; E. Bonamente; A. W. Borgland; A. Bouvier; T. J. Brandt; J. Bregeon; M. Brigida; Pascal Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; S. Carrigan; J. M. Casandjian; C. Cecchi; A. Chekhtman; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; C. D. Dermer; F. de Palma; E. Do Couto e Silva; P. S. Drell; R. Dubois; D. Dumora; C. Farnier; C. Favuzzi; S. J. Fegan; Y. Fukazawa; Y. Fukui; S. Funk; P. Fusco; F. Gargano; N. Gehrels; S. Germani; N. Giglietto; F. Giordano; T. Glanzman; G. Godfrey; I. A. Grenier; J. E. Grove; S. Guiriec; D. Hadasch; Y. Hanabata; A. K. Harding; E. Hays; D. Horan; R. E. Hughes; G. Johannesson; A. S. Johnson; W. N. Johnson; T. Kamae; H. Katagiri; J. Kataoka; Jürgen Knödlseder; M. Kuss; J. Lande; L. Latronico; S.-H. Lee; M. Lemoine-Goumard; M. Llena Garde; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; A. Makeev; M. N. Mazziotta; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; T. Nakamori; P. L. Nolan; J. P. Norris; E. Nuss; M. Ohno; T. Ohsugi; N. Omodei; E. Orlando; J. F. Ormes; M. Ozaki; J. H. Panetta; D. Parent; V. Pelassa; M. Pepe; M. Pesce-Rollins; F. Piron; T. A. Porter; S. Raino; R. Rando; M. Razzano; A. Reimer; O. Reimer; T. Reposeur; A. Y. Rodriguez; M. Roth; H. F.-W. Sadrozinski; A. Sander; P. M. Saz Parkinson; C. Sgro; E. J. Siskind; David Stanley Smith; P. D. Smith; G. Spandre; P. Spinelli; M. S. Strickman; D. J. Suson; H. Tajima; H. Takahashi; T. Takahashi; T. Tanaka; J. B. Thayer; J. G. Thayer; D. J. Thompson; L. Tibaldo; O. Tibolla; D. F. Torres; G. Tosti; Y. Uchiyama; T. Uehara; T. L. Usher; V. Vasileiou; N. Vilchez; V. Vitale; A. P. Waite; P. Wang; B. L. Winer; K. S. Wood; H. Yamamoto; R. Yamazaki; Z. Yang; T. Ylinen; M. Ziegler

doi:10.1088/0004-637X/718/1/348

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Fermi LAT Observations of the Supernova Remnant W28 (G6.4-0.1)

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Fermi LAT Observations of the Supernova Remnant W28 (G6.4-0.1)

A. A. Abdo, M. Ackermann, M. Ajello, A. Allafort, L. Baldini, Jean Ballet, G. Barbiellini, D. Bastieri, K. Bechtol, R. Bellazzini, …

The Astrophysical Journal, Vol.718, pp.348-356

20/07/2010

DOI: https://doi.org/10.1088/0004-637X/718/1/348

Abstract

98.58.Mj Supernova remnants 98.58.Db Molecular clouds, H2 clouds, dense clouds, and dark clouds 95.30.Ky Atomic and molecular data, spectra, and spectral parameters (opacities, rotation constants, line identification, oscillator strengths, g

We present detailed analysis of the two gamma-ray sources,1FGL J1801.3-2322c and 1FGL J1800.5-2359c,that have been found toward the supernova remnant(SNR) W28 with the Large Area Telescope(LAT) on board the Fermi Gamma-ray Space Telescope.1FGL J1801.3-2322c is found to be an extended source within the boundary of SNR W28,and to extensively overlap with the TeV gamma-ray source HESS J1801-233,which is associated with a dense molecular cloud interacting with the supernova remnant.The gamma-ray spectrum measured with LAT from 0.2--100 GeV can be described by a broken power-law function with a break of ~1GeV,and photon indices of 2.09$\pm$0.08(stat)$\pm$0.28(sys) below the break and 2.74$\pm$0.06(stat)$\pm$0.09(sys) above the break.Given the clear association between HESS J1801-233 and the shocked molecular cloud and a smoothly connected spectrum in the GeV--TeV band,we consider the origin of the gamma-ray emission in both GeV and TeV ranges to be the interaction between particles accelerated in the SNR and the molecular cloud.The decay of neutral pions produced in interactions between accelerated hadrons and dense molecular gas provide a reasonable explanation for the broadband gamma-ray spectrum. 1FGL J1800.5-2359c, located outside the southern boundary of SNR W28, cannot be resolved.An upper limit on the size of the gamma-ray emission was estimated to be ~16$'$ using events above ~2GeV under the assumption of a circular shape with uniform surface brightness. It appears to coincide with the TeV source HESS J1800-240B,which is considered to be associated with a dense molecular cloud that contains the ultra compact HII region W28A2(G5.89-0.39).We found no significant gamma-ray emission in the LAT energy band at the positions of TeV sources HESS J1800-230A and HESS J1800-230C.The LAT data for HESS J1800-230A combined with the TeV data points indicate a spectral break between 10GeV and 100GeV.

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Title: Fermi LAT Observations of the Supernova Remnant W28 (G6.4-0.1)
Creators - without role: A. A. Abdo - National Academy of Sciences
M. Ackermann - Kavli Institute for Particle Astrophysics and Cosmology
M. Ajello - Kavli Institute for Particle Astrophysics and Cosmology
A. Allafort - Kavli Institute for Particle Astrophysics and Cosmology
L. Baldini - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
Jean Ballet - Astrophysique, Instrumentation et Modélisation
G. 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
B. Berenji - Kavli Institute for Particle Astrophysics and Cosmology
R. D. Blandford - Kavli Institute for Particle Astrophysics and Cosmology
E. D. Bloom - Kavli Institute for Particle Astrophysics and Cosmology
E. Bonamente - University of Perugia
A. W. Borgland - Stanford University
A. Bouvier - Kavli Institute for Particle Astrophysics and Cosmology
T. J. Brandt - The Ohio State University
J. Bregeon - 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 - INFN Sezione di Padova
G. A. Caliandro - Institute of Space Sciences
R. A. Cameron - Stanford University
P. A. Caraveo - Istituto di Astrofisica Spaziale e Fisica Cosmica di Milano
S. Carrigan - University of Padua
J. M. Casandjian - Université Paris Cité
C. Cecchi - University of Perugia
A. Chekhtman - George Mason University
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 - United States Naval Research Laboratory
F. de Palma - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
E. Do Couto e Silva
P. S. Drell - Kavli Institute for Particle Astrophysics and Cosmology
R. Dubois - SLAC National Accelerator Laboratory
D. Dumora - Laboratoire de Physique des deux infinis Bordeaux
C. Farnier - Laboratoire de Physique Théorique
C. Favuzzi - Polytechnic University of Bari
S. J. Fegan - Laboratoire Leprince-Ringuet
Y. Fukazawa - Hiroshima University
Y. Fukui - Nagoya University
S. Funk - Stanford University
P. Fusco - Polytechnic University of Bari
F. Gargano - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
N. Gehrels - Goddard Space Flight Center
S. Germani - University of Perugia
N. Giglietto - Polytechnic University of Bari
F. Giordano - Polytechnic University of Bari
T. Glanzman - Stanford University
G. Godfrey - Kavli Institute for Particle Astrophysics and Cosmology
I. A. Grenier - CEA Paris-Saclay
J. E. Grove - United States Naval Research Laboratory
S. Guiriec - University of Alabama in Huntsville
D. Hadasch - Institució Catalana de Recerca i Estudis Avançats
Y. Hanabata - Hiroshima University
A. K. Harding - Goddard Space Flight Center
E. Hays - Goddard Space Flight Center
D. Horan - Laboratoire Leprince-Ringuet
R. E. Hughes - The Ohio State University
G. Johannesson - Kavli Institute for Particle Astrophysics and Cosmology
A. S. Johnson - Kavli Institute for Particle Astrophysics and Cosmology
W. N. Johnson - United States Naval Research Laboratory
T. Kamae - Kavli Institute for Particle Astrophysics and Cosmology
H. Katagiri - Hiroshima University
J. Kataoka - Waseda University
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
M. Llena Garde
F. Longo - Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
F. Loparco - Polytechnic University of Bari
M. N. Lovellette - United States Naval Research Laboratory
P. Lubrano - University of Perugia
A. Makeev - United States Naval Research Laboratory
M. N. Mazziotta - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
P. F. Michelson - Kavli Institute for Particle Astrophysics and Cosmology
W. Mitthumsiri - Stanford University
T. Mizuno - Hiroshima University
A. A. Moiseev - Goddard Space Flight Center
C. Monte - Polytechnic University of Bari
M. E. Monzani - Kavli Institute for Particle Astrophysics and Cosmology
A. Morselli - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
I. V. Moskalenko - Stanford University
S. Murgia - Kavli Institute for Particle Astrophysics and Cosmology
T. Nakamori - Tokyo Institute of Technology
P. L. Nolan - Kavli Institute for Particle Astrophysics and Cosmology
J. P. Norris - University of Denver
E. Nuss - Laboratoire de Physique Théorique
M. Ohno - Institute of Space and Astronautical Science
T. Ohsugi - Hiroshima University
N. Omodei - Kavli Institute for Particle Astrophysics and Cosmology
E. Orlando - Max Planck Institute for Extraterrestrial Physics
J. F. Ormes - University of Denver
M. Ozaki - Institute of Space and Astronautical Science
J. H. Panetta - Stanford University
D. Parent - Laboratoire de Physique des deux infinis Bordeaux
V. Pelassa - Laboratoire de Physique Théorique
M. Pepe - University of Perugia
M. Pesce-Rollins - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
F. Piron - Laboratoire de Physique Théorique
T. A. Porter - Kavli Institute for Particle Astrophysics and Cosmology
S. Raino - Istituto Nazionale di Fisica Nucleare, Sezione di Bari
R. Rando - University of Padua
M. Razzano - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
A. Reimer - Universität Innsbruck
O. Reimer - Universität Innsbruck
T. Reposeur - Laboratoire de Physique des deux infinis Bordeaux
A. Y. Rodriguez - Institute of Space Sciences
M. Roth - University of Washington
H. F.-W. Sadrozinski - University of California, Santa Cruz
A. Sander - The Ohio State University
P. M. Saz Parkinson
C. Sgro - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
E. J. Siskind - Real Time Tomography
David Stanley Smith - Laboratoire de Physique des deux infinis Bordeaux
P. D. Smith - The Ohio State University
G. Spandre - Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
P. Spinelli - Polytechnic University of Bari
M. S. Strickman - United States Naval Research Laboratory
D. J. Suson - Purdue University Northwest
H. Tajima - Kavli Institute for Particle Astrophysics and Cosmology
H. Takahashi - Hiroshima University
T. Takahashi - Institute of Space and Astronautical Science
T. Tanaka - Kavli Institute for Particle Astrophysics and Cosmology
J. B. Thayer - Stanford University
J. G. Thayer - Kavli Institute for Particle Astrophysics and Cosmology
D. J. Thompson - Goddard Space Flight Center
L. Tibaldo - CEA Paris-Saclay
O. Tibolla - University of Würzburg
D. F. Torres - Institute of Space Sciences
G. Tosti - Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
Y. Uchiyama - Kavli Institute for Particle Astrophysics and Cosmology
T. Uehara - Hiroshima University
T. L. Usher - Kavli Institute for Particle Astrophysics and Cosmology
V. Vasileiou - Goddard Space Flight Center
N. Vilchez - Université Toulouse III - Paul Sabatier
V. Vitale - Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
A. P. Waite - Kavli Institute for Particle Astrophysics and Cosmology
P. Wang - Kavli Institute for Particle Astrophysics and Cosmology
B. L. Winer - The Ohio State University
K. S. Wood - United States Naval Research Laboratory
H. Yamamoto - Nagoya University
R. Yamazaki - Hiroshima University
Z. Yang - Fraunhofer Chalmers Research Centre for Industrial Mathematics
T. Ylinen - Fraunhofer Chalmers Research Centre for Industrial Mathematics
M. Ziegler - University of California, Santa Cruz
Publication Details: The Astrophysical Journal, Vol.718, pp.348-356
Identifiers: 9938223809311
Academic Unit: Université de Montpellier
Language: English
Resource Type: Journal article
Local Fields: in2p3-00529638