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...
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2013
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00368075_v339_n6121_p807_Ackermann http://hdl.handle.net/20.500.12110/paper_00368075_v339_n6121_p807_Ackermann |
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paper:paper_00368075_v339_n6121_p807_Ackermann2023-06-08T15:02:07Z Detection of the characteristic pion-decay signature in supernova remnants proton cosmic ray detection method electron extraterrestrial matter scattering acceleration article brems radiation compton effect cosmic radiation electron energy gamma radiation infrared radiation pion priority journal radioisotope decay synchrotron radiation telescope 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. 2013 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00368075_v339_n6121_p807_Ackermann http://hdl.handle.net/20.500.12110/paper_00368075_v339_n6121_p807_Ackermann |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
proton cosmic ray detection method electron extraterrestrial matter scattering acceleration article brems radiation compton effect cosmic radiation electron energy gamma radiation infrared radiation pion priority journal radioisotope decay synchrotron radiation telescope |
| spellingShingle |
proton cosmic ray detection method electron extraterrestrial matter scattering acceleration article brems radiation compton effect cosmic radiation electron energy gamma radiation infrared radiation pion priority journal radioisotope decay synchrotron radiation telescope Detection of the characteristic pion-decay signature in supernova remnants |
| topic_facet |
proton cosmic ray detection method electron extraterrestrial matter scattering acceleration article brems radiation compton effect cosmic radiation electron energy gamma radiation infrared radiation pion priority journal radioisotope decay synchrotron radiation telescope |
| 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. |
| title |
Detection of the characteristic pion-decay signature in supernova remnants |
| title_short |
Detection of the characteristic pion-decay signature in supernova remnants |
| title_full |
Detection of the characteristic pion-decay signature in supernova remnants |
| title_fullStr |
Detection of the characteristic pion-decay signature in supernova remnants |
| title_full_unstemmed |
Detection of the characteristic pion-decay signature in supernova remnants |
| title_sort |
detection of the characteristic pion-decay signature in supernova remnants |
| publishDate |
2013 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00368075_v339_n6121_p807_Ackermann http://hdl.handle.net/20.500.12110/paper_00368075_v339_n6121_p807_Ackermann |
| _version_ |
1768546531136241664 |