Physics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sscr.conf..459b&link_type=abstract
In: Supernovae: A survey of current research; Proceedings of the Advanced Study Institute, Cambridge, England, June 29-July 10,
Physics
3
Nonthermal Radiation, Particle Acceleration, Radio Emission, Stellar Evolution, Supernova Remnants, Synchrotron Radiation, Background Radiation, Cosmic Rays, Energetic Particles, Interstellar Gas, Interstellar Magnetic Fields, Relativistic Particles, Shock Fronts
Scientific paper
The nonthermal characteristics of old and new supernovae remnants (SNR) are examined analytically, using observational data as a basis for the calculations. A formulation is devised for the synchrotron radio emission, which has electron and magnetic energy densities. An estimate is made of the cosmic ray production of the remnants, and the possibility that the Fermi mechanism, which models particle acceleration by a random walk of the particles scattered in energy space, is active in SNR is considered. The acceleration energy is found to be distributed 10% to protons and 1% to electrons during the first order Fermi process at the outer shock front in young shell-like remnants. Very old remnants are suggested to have been depleted of pressure and expanded into regions of tenuous clouds of interstellar gas, which are crushed and emit radio and gamma rays, forming the galactic background radiation.
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