A STATISTICAL MODEL FOR THE gamma-RAY VARIABILITY OF THE CRAB NEBULA

	A STATISTICAL MODEL FOR THE gamma-RAY VARIABILITY OF THE CRAB NEBULA
	Yuan, Qiang1,2 ; Yin, Peng-Fei 1; Wu, Xue-Feng2,3,4 ; Bi, Xiao-Jun 1; Liu, Siming3 ; Zhang, Bing 2
刊名	ASTROPHYSICAL JOURNAL LETTERS
	2011-04-01
卷号	730 期号:2 页码:L15(5pp)
关键词	gamma rays: general ISM: individual objects (Crab) radiation mechanisms: non-thermal
ISSN号	2041-8205
英文摘要	A 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.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SYNCHROTRON NEBULA ; PULSAR ; TELESCOPE ; DISCOVERY ; RADIATION ; EMISSION ; COMPTEL ; FLARES ; TEV
收录类别	SCI
语种	英语
WOS记录号	WOS:000293125600003
公开日期	2012-08-07
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/4472]
专题	紫金山天文台_南极天文中心
作者单位	1.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
推荐引用方式 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).