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Detection of the Characteristic Pion-Decay Signature in Supernova Remnants

Cosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter int... Full description

Journal Title: arXiv.org Feb 14, 2013
Main Author: Ackermann, M
Other Authors: Ajello, M , Allafort, A , Baldini, L , Ballet, J , Barbiellini, G , Baring, M , Bastieri, D , Bechtol, K , Bellazzini, R , Blandford, R , Bloom, E , Bonamente, E , Borgland, A , Bottacini, E , Brandt, T , Bregeon, J , Brigida, M , Bruel, P , Buehler
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: DOI: 10.1126/science.1231160
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title: Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
format: Article
creator:
  • Ackermann, M
  • Ajello, M
  • Allafort, A
  • Baldini, L
  • Ballet, J
  • Barbiellini, G
  • Baring, M
  • Bastieri, D
  • Bechtol, K
  • Bellazzini, R
  • Blandford, R
  • Bloom, E
  • Bonamente, E
  • Borgland, A
  • Bottacini, E
  • Brandt, T
  • Bregeon, J
  • Brigida, M
  • Bruel, P
  • Buehler
subjects:
  • Space Telescopes
  • Cosmic Rays
  • Gamma Rays
  • High Energy Astronomy
  • Interstellar Matter
  • Pions
  • Elastic Scattering
  • Acceleration
  • High Energy Electrons
  • Bremsstrahlung
  • Particle Decay
  • Galactic Cosmic Rays
  • Gamma Rays
  • Supernova Remnants
  • High Energy Astrophysical Phenomena
  • Astrophysics of Galaxies
ispartof: arXiv.org, Feb 14, 2013
description: Cosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.
language: eng
source:
identifier: DOI: 10.1126/science.1231160
fulltext: fulltext_linktorsrc
url: Link


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titleDetection of the Characteristic Pion-Decay Signature in Supernova Remnants
creatorAckermann, M ; Ajello, M ; Allafort, A ; Baldini, L ; Ballet, J ; Barbiellini, G ; Baring, M ; Bastieri, D ; Bechtol, K ; Bellazzini, R ; Blandford, R ; Bloom, E ; Bonamente, E ; Borgland, A ; Bottacini, E ; Brandt, T ; Bregeon, J ; Brigida, M ; Bruel, P ; Buehler
contributorZimmer, S (pacrepositoryorg)
ispartofarXiv.org, Feb 14, 2013
identifierDOI: 10.1126/science.1231160
subjectSpace Telescopes ; Cosmic Rays ; Gamma Rays ; High Energy Astronomy ; Interstellar Matter ; Pions ; Elastic Scattering ; Acceleration ; High Energy Electrons ; Bremsstrahlung ; Particle Decay ; Galactic Cosmic Rays ; Gamma Rays ; Supernova Remnants ; High Energy Astrophysical Phenomena ; Astrophysics of Galaxies
descriptionCosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.
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titleDetection of the Characteristic Pion-Decay Signature in Supernova Remnants
descriptionCosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.
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titleDetection of the Characteristic Pion-Decay Signature in Supernova Remnants
authorAckermann, M ; Ajello, M ; Allafort, A ; Baldini, L ; Ballet, J ; Barbiellini, G ; Baring, M ; Bastieri, D ; Bechtol, K ; Bellazzini, R ; Blandford, R ; Bloom, E ; Bonamente, E ; Borgland, A ; Bottacini, E ; Brandt, T ; Bregeon, J ; Brigida, M ; Bruel, P ; Buehler
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29Chaty, S
30Chaves, R
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34Chiaro, G
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atitleDetection of the Characteristic Pion-Decay Signature in Supernova Remnants
jtitlearXiv.org
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abstractCosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.
copIthaca
pubCornell University Library, arXiv.org
doi10.1126/science.1231160
urlhttp://search.proquest.com/docview/2085264944/
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issue6121
volume339
pages807-811
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eissn10959203
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date2013-02-14