On the continuum radio-spectrum of Cas A: possible evidence of the non-linear particle acceleration

TL;DR

This paper analyzes Cas A's radio spectrum, suggesting that recent data indicate non-linear particle acceleration effects in this young supernova remnant, evidenced by spectral curvature at high frequencies.

Contribution

It provides evidence of non-linear particle acceleration in Cas A based on analysis of its radio spectrum and recent Planck data.

Findings

Spectral curvature observed at high frequencies.

Evidence supporting non-linear particle acceleration.

Planck data reveals spectral features consistent with non-linear processes.

Abstract

Integrated radio-spectrum of Cas A in continuum was analyzed with special emphasis on possible high frequency spectral curvature. We conclude that the most probable scenario is that Planck's new data reveal the imprint of non-linear particle acceleration in the case of this young Galactic supernova remnant (SNR).