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Electron Acceleration in Middle-age Shell-type gamma-Ray Supernova Remnants
Zhang, Xiao1,2; Liu, Siming3
2019-05-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume876Issue:1Pages:8
Corresponding AuthorZhang, Xiao(xiaozhang@nju.edu.cn)
AbstractOver the past decade, gamma-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 gamma-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 t(2)(.5) in the absence of escape from SNRs.
Keywordgamma rays: ISM ISM: supernova remnants radiation mechanisms: non-thermal
DOI10.3847/1538-4357/ab14df
WOS KeywordDIFFUSIVE SHOCK ACCELERATION ; HIGH-ENERGY ELECTRONS ; COSMIC-RAYS ; SYNCHROTRON EMISSION ; RX J0852.0-4622 ; PROPER MOTIONS ; RCW 86 ; DISCOVERY ; TEV ; CLOUDS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000466718700001
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24732
Collection中国科学院紫金山天文台
Corresponding AuthorZhang, Xiao
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, 163 Xianlin Ave, Nanjing 210023, Jiangsu, Peoples R China
2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210023, Jiangsu, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Xiao,Liu, Siming. Electron Acceleration in Middle-age Shell-type gamma-Ray Supernova Remnants[J]. ASTROPHYSICAL JOURNAL,2019,876(1):8.
APA Zhang, Xiao,&Liu, Siming.(2019).Electron Acceleration in Middle-age Shell-type gamma-Ray Supernova Remnants.ASTROPHYSICAL JOURNAL,876(1),8.
MLA Zhang, Xiao,et al."Electron Acceleration in Middle-age Shell-type gamma-Ray Supernova Remnants".ASTROPHYSICAL JOURNAL 876.1(2019):8.
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