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A STATISTICAL MODEL FOR THE gamma-RAY VARIABILITY OF THE CRAB NEBULA
Yuan, Qiang1,2; Yin, Peng-Fei1; Wu, Xue-Feng2,3,4; Bi, Xiao-Jun1; Liu, Siming3; Zhang, Bing2
2011-04-01
Source PublicationASTROPHYSICAL JOURNAL LETTERS
ISSN2041-8205
Volume730Issue:2Pages:L15(5pp)
AbstractA statistical scenario is proposed to explain the gamma-ray variability and flares of the Crab Nebula, which were observed recently by the Fermi/LAT. In this scenario electrons are accelerated in a series of knots, whose sizes follow a power-law distribution. These knots presumably move outward from the pulsar and have a distribution in the Doppler boost factor. The maximal electron energy is assumed to be proportional to the size of the knot. Fluctuations at the highest energy end of the overall electron distribution will result in variable gamma-ray emission via the synchrotron process in the similar to 100 MeV range. Since highly boosted larger knots are rarer than smaller knots, the model predicts that the variability of the synchrotron emission increases with the photon energy. We realize such a scenario with a Monte Carlo simulation and find that the model can reproduce both the two gamma-ray flares over a period of similar to 1 year and the monthly scale gamma-ray flux fluctuations as observed by the Fermi/LAT. The observed gamma-ray spectra in both the steady and flaring states are also well reproduced.
KeywordGamma Rays: General Ism: Individual Objects (Crab) Radiation Mechanisms: Non-thermal
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/2041-8205/730/2/L15
WOS KeywordSYNCHROTRON NEBULA ; PULSAR ; TELESCOPE ; DISCOVERY ; RADIATION ; EMISSION ; COMPTEL ; FLARES ; TEV
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000293125600003
Citation statistics
Cited Times:20[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4472
Collection南极天文中心
Affiliation1.Chinese Acad Sci, Key Lab Particle Astrophys, Inst High Energy Phys, Beijing 100049, Peoples R China
2.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
4.Joint Ctr Particle Nucl Phys & Cosmol J CPNPC, Nanjing 210093, Peoples R China
Recommended Citation
GB/T 7714
Yuan, Qiang,Yin, Peng-Fei,Wu, Xue-Feng,et al. A STATISTICAL MODEL FOR THE gamma-RAY VARIABILITY OF THE CRAB NEBULA[J]. ASTROPHYSICAL JOURNAL LETTERS,2011,730(2):L15(5pp).
APA Yuan, Qiang,Yin, Peng-Fei,Wu, Xue-Feng,Bi, Xiao-Jun,Liu, Siming,&Zhang, Bing.(2011).A STATISTICAL MODEL FOR THE gamma-RAY VARIABILITY OF THE CRAB NEBULA.ASTROPHYSICAL JOURNAL LETTERS,730(2),L15(5pp).
MLA Yuan, Qiang,et al."A STATISTICAL MODEL FOR THE gamma-RAY VARIABILITY OF THE CRAB NEBULA".ASTROPHYSICAL JOURNAL LETTERS 730.2(2011):L15(5pp).
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