Mechanism of regular acceleration and evolution of supernova remnants

Details Mechanism of regular acceleration and evolution of supernova remnants Mechanism of regular acceleration and evolution of supernova remnants

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.123..237a&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 123, no. 2, June 1986, p. 237-258.

Astronomy and Astrophysics

Astrophysics

10

Interstellar Magnetic Fields, Particle Acceleration, Stellar Evolution, Supernova Remnants, Emission Spectra, Magellanic Clouds, Milky Way Galaxy, Relativistic Electron Beams, Shock Fronts, Synchrotron Radiation, X Ray Sources

Scientific paper

A mechanism for the regular acceleration of charged particles at the shock front in shell-type supernova remnants (SNRs) is demonstrated. In order to satisfy the observed fact that there is no separation of SNR emissivity by spectral indices (alpha), it is necessary that the value of phi(e) times psi(e) to the alpha, where phi(e) is the fraction of particles injected into the mechanism and psi(e) is the threshold energy of injection, should be a strongly increasing function of alpha. The shape of this function is obtained by using calibration objects with independently estimated magnetic fields, and its behavior with respect to the evolution of SNRs is investigated. The magnetic-field values estimated for the chosen SNRs with the aid of this function are close to their minimum values if the proton component of relativistic particles is ignored. The ratio of magnetic-field energy density to the kinetic energy density increases with the increase of the SNR diameter.

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