Electron Acceleration in Middle-age Shell-type γ-Ray Supernova Remnants
Zhang,Xiao1,2; Liu,Siming3
Source PublicationThe Astrophysical Journal

Abstract Over the past decade, γ-ray observations of supernova remnants (SNRs) and accurate cosmic-ray (CR) spectral measurements have significantly advanced our understanding of particle acceleration in SNRs. In combination with multiwavelength observations of a large sample of SNRs, it has been proposed that the highest energy particles are mostly accelerated in young remnants, and the maximum energy that middle-age and old SNRs can accelerate particles to decreases rapidly with the decrease in shock speed. If SNRs dominate the CR flux observed at Earth, a large number of particles need to be accelerated in old SNRs for the soft CR spectrum even though they cannot produce very high-energy CRs. With radio, X-ray, and γ-ray observations of seven middle-age shell-type SNRs, we derive the distribution of high-energy electrons trapped in these remnants via a simple one-zone leptonic emission model and find that their spectral evolution is consistent with such a scenario. In particular, we find that particle acceleration by shocks in middle-age SNRs with age t can be described by a unified model with the maximum energy decreasing as t?3.1 and the number of GeV electrons increasing as t2.5 in the absence of escape from SNRs.

Keywordgamma rays: ISM ISM: supernova remnants radiation mechanisms: non-thermal
WOS IDIOP:0004-637X-876-1-ab14df
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.School of Astronomy & Space Science, Nanjing University, 163 Xianlin Avenue, Nanjing?210023, People’s Republic of China;
2.Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University, Ministry of Education, Nanjing?210023, People’s Republic of China
3.Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, 8 Yuanhua Road, Nanjing 210034, People’s Republic of China;
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GB/T 7714
Zhang,Xiao,Liu,Siming. Electron Acceleration in Middle-age Shell-type γ-Ray Supernova Remnants[J]. The Astrophysical Journal,2019,876(1):1.
APA Zhang,Xiao,&Liu,Siming.(2019).Electron Acceleration in Middle-age Shell-type γ-Ray Supernova Remnants.The Astrophysical Journal,876(1),1.
MLA Zhang,Xiao,et al."Electron Acceleration in Middle-age Shell-type γ-Ray Supernova Remnants".The Astrophysical Journal 876.1(2019):1.
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