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Supernova remnants and the origin of cosmic rays

Published online by Cambridge University Press:  29 January 2014

Jacco Vink
Jacco Vink*
Affiliation:
Astronomical Institute Anton Pannekoek & GRAPPA, Universiteit van Amsterdam, Postbus 94249, 1090 GE Amsterdam, The Netherlands email: [email protected]
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Abstract

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Supernova remnants have long been considered to be the dominant sources of Galactic cosmic rays. For a long time the prime evidence consisted of radio synchrotron radiation from supernova remnants, indicating the presence of electrons with energies of several GeV. However, in order to explain the cosmic ray energy density and spectrum in the Galaxy supernova remnant should use 10% of the explosion energy to accelerate particles, and about 99% of the accelerated particles should be protons and other atomic nuclei.

Over the last decade a lot of progress has been made in providing evidence that supernova remnant can accelerate protons to very high energies. The evidence consists of, among others, X-ray synchrotron radiation from narrow regions close to supernova remnant shock fronts, indicating the presence of 10-100 TeV electrons, and providing evidence for amplified magnetic fields, gamma-ray emission from both young and mature supernova remnants. The high magnetic fields indicate that the condition for accelerating protons to >1015 eV are there, whereas the gamma-ray emission from some mature remnants indicate that protons have been accelerated.

Keywords

acceleration of particlesmagnetic fieldsradiation mechanisms: nonthermalshock waves(stars:) supernovae: general(ISM:) cosmic rays(ISM:) supernova remnants
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S296: Supernova Environmental Impacts , January 2013 , pp. 305 - 314
Copyright
Copyright © International Astronomical Union 2014 

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