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Gamma-ray Emission from Crushed Clouds in Supernova Remnants

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arxiv 1008.1840 v2 pith:3JUMHMBA submitted 2010-08-11 astro-ph.HE

Gamma-ray Emission from Crushed Clouds in Supernova Remnants

classification astro-ph.HE
keywords emissiongamma-rayobservedsupernovacloudmodelradioremnants
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 2 Pith papers

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  1. Supernova remnants in the new radio astronomy era

    astro-ph.HE 2026-06 unverdicted novelty 2.0

    A review summarizing current challenges in radio observations of supernova remnants and the expected scientific gains from SKA-era instruments.

  2. IceCube Results and Perspective for Neutrinos from LHAASO Sources

    astro-ph.HE 2024-04 unverdicted novelty 2.0

    Reviews IceCube neutrino results, models Galactic plane flux from cosmic ray interactions with the interstellar medium, and discusses prospects for identifying PeVatrons via LHAASO sources.