English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We calculate synchrotron radio emission and gamma-ray emission due tobremsstrahlung, inverse-Compton scattering and $pi^0$-decay from the remnant ofsupernova which exploded in the circumstellar matter (CSM) formed by theprogenitor's stellar wind. This sort of situation is a possible origin ofmixed-morphology supernova remnants (SNRs) like W49B, which exhibitrecombination-radiation spectra in X-ray emission. We assume that the CSM of1.5 $M_{odot}$ exists at 0.07--3 pc away from the supernova in the interstellarmedium (ISM) of density 0.016 cm$^{-3}$. When the blast wave breaks out of theCSM into the ISM, its velocity rapidly increases and hence particleacceleration is enhanced. The maximum energy of protons reaches $sim$ 1300 TeVjust after the break-out with $sim$ 0.5% of the explosion energy. We considerthe non-thermal emission from the blast-shocked ISM shell after the break-out.Synchrotron radio flux at 1 GHz is tens Jy, comparable to the observed frommixed-morphology SNRs. Because of low density, the gamma-ray luminosity isdominated by inverse-Compton scattering, which is higher than the $pi^0$-decayluminosity by an order of magnitude. The total gamma-ray luminosity includingbremsstrahlung is of the order of $10^{33}$ erg s$^{-1}$ lower than the typicalvalue $10^{35}$--$10^{36}$ erg s$^{-1}$ observed from mixed-morphology SNRs.However, if, e.g., $sim$10% of accelerated protons interact with some matter ofdensity $sim$100 cm$^{-3}$, $pi^0$-decay gamma-ray luminosity would be enhancedto be comparable with the observed value.

Non-Thermal Radio and Gamma-Ray Emission from a Supernova Remnant by the Blast Wave Breaking Out of the Circumstellar Matter