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Abstract:

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.

Registro:

Documento: Artículo
Título:Detection of the characteristic pion-decay signature in supernova remnants
Autor:Ackermann, M. et al.
Este artículo contiene 169 autores, consultelos en el artículo en formato pdf.
Filiación: Este artículo contiene 169 autores con sus filiaciones, consultelas en el artículo en formato pdf.
Palabras clave: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
Año:2013
Volumen:339
Número:6121
Página de inicio:807
Página de fin:811
DOI: http://dx.doi.org/10.1126/science.1231160
Título revista:Science
Título revista abreviado:Science
ISSN:00368075
CODEN:SCIEA
CAS:proton, 12408-02-5, 12586-59-3
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00368075_v339_n6121_p807_Ackermann

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Citas:

---------- APA ----------
(2013) . Detection of the characteristic pion-decay signature in supernova remnants. Science, 339(6121), 807-811.
http://dx.doi.org/10.1126/science.1231160
---------- CHICAGO ----------
Ackermann, M. "Detection of the characteristic pion-decay signature in supernova remnants" . Science 339, no. 6121 (2013) : 807-811.
http://dx.doi.org/10.1126/science.1231160
---------- MLA ----------
Ackermann, M. "Detection of the characteristic pion-decay signature in supernova remnants" . Science, vol. 339, no. 6121, 2013, pp. 807-811.
http://dx.doi.org/10.1126/science.1231160
---------- VANCOUVER ----------
Ackermann, M. Detection of the characteristic pion-decay signature in supernova remnants. Science. 2013;339(6121):807-811.
http://dx.doi.org/10.1126/science.1231160