The radio spectrum of VELA supernova and its implication on the propagation of cosmic rays from sources

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Rays, Radio Sources (Astronomy), Radio Spectra, Supernova Remnants, Astronomical Models, Galactic Radiation, Gamma Rays, Magnetic Fields, Radiant Flux Density

Scientific paper

A detailed analysis of the radio spectrum of the Vela supernova remnant has been carried out to show that the positive spectral shape below 80 MHz can be understood on the basis of Razin effect. This result requires most of the gas in the remnant to be stratified into high density clumps with intense magnetic fields and large cosmic ray densities. The free-free emission is found to be partly responsible for the observed flat radio spectrum. In order to account for both the gamma ray flux above 100 MeV and the radio spectrum, the equipartition between the cosmic ray density and magnetic field seems to break down. The total cosmic ray energy residing in the supernova is found to be about ten to the forty-ninth ergs, which is much smaller than the value obtained without taking into account the stratification of gas.

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