Gamma-ray Emission from Crushed Clouds in Supernova Remnants
Abstract
It is shown that the radio and gamma-ray emission observed from newly-found "GeV-bright" supernova remnants (SNRs) can be explained by a model, in which a shocked cloud and shock-accelerated cosmic rays (CRs) frozen in it are simultaneously compressed by the supernova blastwave as a result of formation of a radiative cloud shock. Simple reacceleration of pre-existing CRs is generally sufficient to power the observed gamma-ray emission through the decays of neutral pions produced in hadronic interactions between high-energy protons (nuclei) and gas in the compressed-cloud layer. This model provides a natural account of the observed synchrotron radiation in SNRs W51C, W44 and IC 443 with flat radio spectral index, which can be ascribed to a combination of secondary and reaccelerated electrons and positrons.
Cite
@article{arxiv.1008.1840,
title = {Gamma-ray Emission from Crushed Clouds in Supernova Remnants},
author = {Yasunobu Uchiyama and Roger Blandford and Stefan Funk and Hiroyasu Tajima and Takaaki Tanaka},
journal= {arXiv preprint arXiv:1008.1840},
year = {2015}
}
Comments
5 pages, 2 figures, minor modifications made in Introduction and Discussion, accepted for publication in ApJL