PMO OpenIR
Global constraints on diffusive particle acceleration by strong non-relativistic shocks
Zhang, Yiran1,2; Liu, Siming1,2
2019-02-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume482Issue:4Pages:5268-5274
Corresponding AuthorZhang, Yiran(zhangyr@pmo.ac.cn) ; Liu, Siming(liusm@pmo.ac.cn)
AbstractEstimating the cosmic-ray acceleration efficiency epsilon in supernova remnants (SNRs) through observations is a challenging task in general. Based on the Rankine-Hugoniot shock conditions, we find an anticorrelation between epsilon and the power-law spectral index alpha of relativistic particle distribution produced via diffusive particle acceleration by non-relativistic shocks, implying more efficient acceleration in older SNRs with harder radio spectra. Then epsilon may be estimated from some hard radio spectral index measurements. Assuming the particle distribution in downstream of strong shocks to be a non-relativistic Maxwellian plus a relativistic power law with a high-energy cut-off, we also find that the injection rate for relativistic particles eta needs to greater than or similar to 10(-6) for a prominent decrease of the adiabatic index in SNRs, which implies higher compression ratio and lower values of alpha. This threshold of eta increases with the shock speed u(1), which may explain the relatively harder radio spectra of older SNRs with lower u(1). We show that eta and/or the relativistic cut-off momentum p(m) need to be low for old SNRs, and expect a gradual increase of epsilon as SNR evolves with gradually decreasing eta and p(m).
Keywordacceleration of particles shock waves cosmic rays ISM: supernova remnants
DOI10.1093/mnras/sty3136
WOS KeywordSUPERNOVA-REMNANTS ; CYGNUS LOOP ; ELECTRONS ; SPECTRA ; RADIO ; EMISSION ; DISTANCE ; ESCAPE ; TYCHO
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000462327300074
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/24203
Collection中国科学院紫金山天文台
Corresponding AuthorZhang, Yiran; Liu, Siming
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210034, Jiangsu, Peoples R China
2.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Yiran,Liu, Siming. Global constraints on diffusive particle acceleration by strong non-relativistic shocks[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2019,482(4):5268-5274.
APA Zhang, Yiran,&Liu, Siming.(2019).Global constraints on diffusive particle acceleration by strong non-relativistic shocks.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,482(4),5268-5274.
MLA Zhang, Yiran,et al."Global constraints on diffusive particle acceleration by strong non-relativistic shocks".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 482.4(2019):5268-5274.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhang, Yiran]'s Articles
[Liu, Siming]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhang, Yiran]'s Articles
[Liu, Siming]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhang, Yiran]'s Articles
[Liu, Siming]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.