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AN ATTEMPT AT A UNIFIED MODEL FOR THE GAMMA-RAY EMISSION OF SUPERNOVA REMNANTS
Yuan, Qiang1; Liu, Siming2; Bi, Xiaojun1
2012-12-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume761Issue:2Pages:133(7pp)
AbstractShocks of supernova remnants (SNRs) are important (and perhaps the dominant) agents for the production of the Galactic cosmic rays. Recent gamma-ray observations of several SNRs have made this case more compelling. However, these broadband high-energy measurements also reveal a variety of spectral shapes demanding more comprehensive modeling of emissions from SNRs. According to the locally observed fluxes of cosmic-ray protons and electrons, the electron-to-proton number ratio is known to be about 1%. Assuming such a ratio is universal for all SNRs and identical spectral shape for all kinds of accelerated particles, we propose a unified model that ascribes the distinct gamma-ray spectra of different SNRs to variations of the medium density and the spectral difference between cosmic-ray electrons and protons observed from Earth to transport effects. For low-density environments, the gamma-ray emission is inverse-Compton dominated. For high-density environments like systems of high-energy particles interacting with molecular clouds, the gamma-ray emission is pi(0)-decay dominated. The model predicts a hadronic origin of gamma-ray emission from very old remnants interacting mostly with molecular clouds and a leptonic origin for intermediate-age remnants whose shocks propagate in a low-density environment created by their progenitors via, e. g., strong stellar winds. These results can be regarded as evidence in support of the SNR origin of Galactic cosmic rays.
KeywordCosmic Rays Gamma Rays: Ism Ism: Supernova Remnants Radiation Mechanisms: Non-thermal
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/761/2/133
WOS KeywordLARGE-AREA TELESCOPE ; ACCUMULATED DIFFUSIVE PROTONS ; XMM-NEWTON OBSERVATIONS ; GALACTIC COSMIC-RAYS ; SNR RX J1713.7-3946 ; FERMI-LAT DISCOVERY ; MOLECULAR CLOUDS ; HIGH-ENERGY ; MAGNETIC-FIELD ; IC 443
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000312090300052
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8046
Collection太阳高能及相关物理过程研究团组
Affiliation1.Chinese Acad Sci, Inst High Energy Phys, Key Lab Particle Astrophys, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Yuan, Qiang,Liu, Siming,Bi, Xiaojun. AN ATTEMPT AT A UNIFIED MODEL FOR THE GAMMA-RAY EMISSION OF SUPERNOVA REMNANTS[J]. ASTROPHYSICAL JOURNAL,2012,761(2):133(7pp).
APA Yuan, Qiang,Liu, Siming,&Bi, Xiaojun.(2012).AN ATTEMPT AT A UNIFIED MODEL FOR THE GAMMA-RAY EMISSION OF SUPERNOVA REMNANTS.ASTROPHYSICAL JOURNAL,761(2),133(7pp).
MLA Yuan, Qiang,et al."AN ATTEMPT AT A UNIFIED MODEL FOR THE GAMMA-RAY EMISSION OF SUPERNOVA REMNANTS".ASTROPHYSICAL JOURNAL 761.2(2012):133(7pp).
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