Nonthermal radiation from pulsar wind nebulae

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	Nonthermal radiation from pulsar wind nebulae
	Zhang L(张力)1,2 ; Chen, SB 1; Fang, J 1
刊名	ASTROPHYSICAL JOURNAL
	2008-04-01
卷号	676 期号:2 页码:1210-1217
关键词	gamma rays : theory ISM : individual (Crab Nebula, MSH 15-52, HESS J1825-137)
ISSN号	0004-637X
通讯作者	Zhang, L (reprint author), Yunnan Univ, Dept Phys, Kunming 650091, Yunnan, Peoples R China.
产权排序	第二完成单位
英文摘要	We study the nonthermal emission of pulsar wind nebulae (PWNe) from radio to TeV gamma-ray energies with a simplified time-dependent injection model. In this model, a relativistic wind of particles driven by a central pulsar with a spin-down power L(t) is blown into the ambient medium and a shock wave is formed, which accelerates the particles to very high energies through the Fermi acceleration mechanism in the PWN. The relativistic particles in the PWN therefore consist of two components, one coming directly from the pulsar magnetosphere and the other from shock acceleration in the PWN. The model PWN spectra follow a broken power law with different indices and a break energy E-b. The accelerated particles produce nonthermal photons through synchrotron radiation and inverse Compton scattering off soft photon fields. We apply this model to the Crab Nebula, the PWN in MSH 15 - 52, and HESS J1825 - 137, which have all been found to emit very high energy (VHE) photons. Our results indicate that ( 1) the observed data, ranging from radio to VHE gamma-rays, for the Crab Nebula can be reproduced by this model, where the emission from radio to medium-energy gamma-rays is from the synchrotron emission due to the injected electrons, whereas the high-energy photons primarily come from inverse Compton scattering of the high-energy electrons on synchrotron photons; and ( 2) the TeV emission from the PWN in MSH 15 - 52 and HESS J1825 - 137 mainly comes from the inverse Compton scattering of the high-energy electrons on infrared photons.
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]	ENERGY GAMMA-RAYS ; CRAB-NEBULA ; X-RAY ; SUPERNOVA REMNANT ; NEUTRON-STARS ; PSR B1823-13 ; MSH 15-52 ; VELA-X ; TEV ; SYNCHROTRON
收录类别	SCI
原文出处	http://iopscience.iop.org/0004-637X/676/2/1210/
语种	英语
WOS记录号	WOS:000254530600037
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4225]
专题	云南天文台_其他
作者单位	1.Department of Physics, Yunnan University, Kunming, 650091 Yunnan, China 2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, 650011 Yunnan, China
推荐引用方式 GB/T 7714	Zhang L,Chen, SB,Fang, J. Nonthermal radiation from pulsar wind nebulae[J]. ASTROPHYSICAL JOURNAL,2008,676(2):1210-1217.
APA	Zhang L,Chen, SB,&Fang, J.(2008).Nonthermal radiation from pulsar wind nebulae.ASTROPHYSICAL JOURNAL,676(2),1210-1217.
MLA	Zhang L,et al."Nonthermal radiation from pulsar wind nebulae".ASTROPHYSICAL JOURNAL 676.2(2008):1210-1217.