Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992azh....69..753a&link_type=abstract
Astronomicheskij Zhurnal (ISSN 0004-6299), vol. 69, no. 4, p. 753-766.
Astronomy and Astrophysics
Astronomy
2
Electron Distribution, Particle Acceleration, Radio Emission, Shock Wave Propagation, Supernova Remnants, Distribution Functions, Stellar Evolution, Synchrotron Radiation
Scientific paper
A model for the evolution of the radio emission of shell-type SNRs in the adiabatic Sedov phase is presented. The adiabatic losses of the accelerated electrons are taken into account. SNRs are found to evolve with nearly constant radio surface brightness if the shock Mach number is greater than the critical M and decreases with SNR diameter Ds as Ds exp -(5-5.5) if M is less than the critical M. The value of the critical M depends solely on the electron injection mechanism: it is approximately equal to 4 if electrons are accelerated from some constant pulse value and to 6-7 in the case of superthermal electron acceleration.
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