Frequency Dependence of Radio Images of Supernova Remnants

TL;DR

This paper investigates how the observed size of supernova remnants varies with radio frequency using diffusion models, explaining why remnants appear larger at lower frequencies like decametric waves.

Contribution

It introduces a diffusion-based model to explain frequency-dependent size variations of supernova remnants in radio images.

Findings

Remnant size appears larger at lower frequencies due to diffusion effects.

Distribution profiles of synchrotron radiation vary with frequency.

The model aligns with observational data from UTR-2.

Abstract

Radio images of supernova remnants in the framework of diffusion model are discussed. The distribution profiles of synchrotron radiation intensity for spherical injection source of relativistic electrons are reduced at different frequencies. An explanation of the observational data obtained on UTR-2, according to which the size of the supernova remnant at decametric waves is larger than the remnant size at high frequencies, is given.