Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976comap...6...99c&link_type=abstract
Comments on Modern Physics, Part C - Comments on Astrophysics, vol. 6, July 1976, p. 99-103.
Astronomy and Astrophysics
Astronomy
Cosmic X Rays, Particle Acceleration, Radio Astronomy, Relativistic Particles, Supernova Remnants, Abundance, Dynamic Models, Energy Distribution, Energy Spectra, Galactic Radiation, Gas Mixtures, High Energy Electrons, Radio Sources (Astronomy), Stellar Envelopes
Scientific paper
X-ray and radio observations of Cas A, a representative supernova remnant, allow a Fermi acceleration model to be developed which explains the properties of the relativistic particle energy spectrum of the remnant. Since Cas A has properties similar to those of other supernova remnants, it is natural to speculate that the cosmic rays observed at earth originate in the same way as the relativistic electrons in Cas A. It has been observed that these relativistic electrons have an energy distribution similar to that for cosmic rays. The Fermi acceleration model also hypothesizes that the accelerated particles come from a mixture of circumstellar gas, and Cas A knots may have originated from the core of a massive star where many of the heavy elements are probably created. A mixture of core material and gas of normal abundance can reproduce the observed cosmic ray abundances. However, according to the Fermi mechanism, acceleration up to 4,000 TeV can occur, while there is a steepening of the observed cosmic ray spectrum at this energy. Hence more cosmic rays must be produced by a different mechanism and may be of extragalactic origin.
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