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EVOLUTION OF HIGH-ENERGY PARTICLE DISTRIBUTION IN MATURE SHELL-TYPE SUPERNOVA REMNANTS
Zeng, Houdun1,2; Xin, Yuliang1,3; Liu, Siming1; Jokipii, J. R.4; Zhang, Li2,5; Zhang, Shuinai1
2017-01-10
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume834Issue:2Pages:9
Corresponding AuthorZeng, Houdun(zhd@pmo.ac.cn)
AbstractMulti-wavelength observations of mature supernova remnants (SNRs), especially with recent advances in gamma-ray astronomy, make it possible to constrain energy distribution of energetic particles within these remnants. In consideration of the SNR origin of Galactic cosmic rays and physics related to particle acceleration and radiative processes, we use a simple one-zone model to fit the nonthermal emission spectra of three shell-type SNRs located within 2 degrees on the sky: RX J1713.7-3946, CTB 37B, and CTB 37A. Although radio images of these three sources all show a shell (or half-shell) structure, their radio, X-ray, and gamma-ray spectra are quite different, offering an ideal case to explore evolution of energetic particle distribution in SNRs. Our spectral fitting shows that (1) the particle distribution becomes harder with aging of these SNRs, implying a continuous acceleration process, and the particle distributions of CTB 37A and CTB 37B in the GeV range are harder than the hardest distribution that can be produced at a shock via the linear diffusive shock particle acceleration process, so spatial transport may play a role; (2) the energy loss timescale of electrons at the high-energy cutoff due to synchrotron radiation appears to be always a bit (within a factor of a few) shorter than the age of the corresponding remnant, which also requires continuous particle acceleration; (3) double power-law distributions are needed to fit the spectra of CTB 37B and CTB 37A, which may be attributed to shock interaction with molecular clouds.
Keywordcosmic rays gamma rays: ISM ISM: supernova remnants radiation mechanisms: non-thermal
DOI10.3847/1538-4357/834/2/153
WOS KeywordSNR RX J1713.7-3946 ; GAMMA-RAY EMISSION ; AREA TELESCOPE OBSERVATIONS ; CTB 37A ; MOLECULAR CLOUDS ; INTERSTELLAR GAS ; MAGNETIC-FIELD ; COSMIC-RAYS ; ELECTRON ACCELERATION ; NONTHERMAL EMISSION
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000393759200015
PublisherIOP PUBLISHING LTD
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23253
Collection中国科学院紫金山天文台
Corresponding AuthorZeng, Houdun
Affiliation1.Chinese Acad Sci, Key Lab Dark Matter & Space Astron, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Key Lab Astroparticle Phys Yunnan Prov, Kunming 650091, Peoples R China
3.Univ Chinese Acad Sci, Yuquan Rd 19, Beijing 100049, Peoples R China
4.Univ Arizona, Tucson, AZ 85721 USA
5.Yunnan Univ, Dept Astron, Kunming 650091, Peoples R China
Recommended Citation
GB/T 7714
Zeng, Houdun,Xin, Yuliang,Liu, Siming,et al. EVOLUTION OF HIGH-ENERGY PARTICLE DISTRIBUTION IN MATURE SHELL-TYPE SUPERNOVA REMNANTS[J]. ASTROPHYSICAL JOURNAL,2017,834(2):9.
APA Zeng, Houdun,Xin, Yuliang,Liu, Siming,Jokipii, J. R.,Zhang, Li,&Zhang, Shuinai.(2017).EVOLUTION OF HIGH-ENERGY PARTICLE DISTRIBUTION IN MATURE SHELL-TYPE SUPERNOVA REMNANTS.ASTROPHYSICAL JOURNAL,834(2),9.
MLA Zeng, Houdun,et al."EVOLUTION OF HIGH-ENERGY PARTICLE DISTRIBUTION IN MATURE SHELL-TYPE SUPERNOVA REMNANTS".ASTROPHYSICAL JOURNAL 834.2(2017):9.
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