Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-01-21
Astronomy and Astrophysics
Astrophysics
4 pages, 1 figure, in Proc.of the 26th International Cosmic Ray Conference, Vol.III,p.472 (OG 2.2.10), corrected some typos
Scientific paper
In present study I examine the capability of diffusive shock acceleration mechanism to explain existing data on radio emission from evolved large diameter shell-type adiabatic supernova remnants (SNRs). Time-dependent ''onion-shell'' model for the radio emission of SNRs is developed, which is based on the assumptions: a) acceleration takes place from thermal energies and test-particle approximation is valid; b) the problem of injection is avoided by introducing, like Bell (1978), two injection parameters; c) to take into consideration very late stages of SNR evolution the analytic approximation of Cox and Andersen (1982) for the shell structure is used; c)no radiative cooling. Constructed Surface Brightness - Diameter $(\Sigma -D)$ tracks are compared with the empirical $\Sigma -D$ diagram. The main conclusion of the study is that the DSA mechanism is capable of explaining all the statistics of radio SNRs including very large diameter remnants and giant galactic loops.
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