Inefficient Cosmic-Ray Diffusion around Vela X: Constraints from HESS Observations of Very High-energy Electrons

doi:10.3847/1538-4357/aadfed

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	Inefficient Cosmic-Ray Diffusion around Vela X: Constraints from HESS Observations of Very High-energy Electrons
	Zhi-Qiu, Huang; Fang K(方堃); Kun, Fang; Ruo-Yu, Liu; Xiang-Yu, Wang
	2018
发表期刊	ASTROPHYSICAL JOURNAL (IF:5.533[JCR-2016],5.342[5-Year])
ISSN	0004-637X
EISSN	1538-4357
卷号	866 期号:2 页码:143
文章类型	Article
摘要	Vela X is a nearby pulsar wind nebula (PWN) powered by a similar to 10(4) year old pulsar. Modeling of the spectral energy distribution of the Vela X PWN has shown that accelerated electrons have largely escaped from the confinement, which is likely due to the disruption of the initially confined PWN by the supernova remnant reverse shock. The escaped electrons propagate to the Earth and contribute to the measured local cosmic-ray (CR) electron spectrum. We find that the escaped CR electrons from Vela X would hugely exceed the measured flux by High Energy Stereoscopic System (HESS) at similar to 10 TeV if the standard diffusion coefficient for the interstellar medium (ISM) is used. We propose that the diffusion may be highly inefficient around Vela X and find that a spatially dependent diffusion can lead to CR flux that is consistent with the HESS measurement. Using a two-zone model for the diffusion around Vela X, we find that the diffusion coefficient in the inner region of a few tens of parsecs should be less than or similar to 10(28) cm(2) s(-1) for similar to 10 TeV CR electrons, which is about two orders of magnitude lower than the standard value for the ISM. Such inefficient diffusion around PWN resembles the case of the Geminga and Monogem PWNe, suggesting that inefficient diffusion may be common in the vicinity of PWNe that span a wide range of ages.
关键词	cosmic rays
DOI	10.3847/1538-4357/aadfed
关键词[WOS]	PULSAR WIND NEBULA ; GAMMA-RAYS ; PROTONS
收录类别	SCI
语种	英语
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
WOS记录号	WOS:000448201700008
ADS Bibcode	2018ApJ...866..143H
AXRIV号	1807
INSPIRE ID	1681792
引用统计	正在获取... 被引频次：10 [ADS]
文献类型	期刊论文
条目标识符	https://ir.ihep.ac.cn/handle/311005/286791
专题	粒子天体物理中心
作者单位	中国科学院高能物理研究所
第一作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	Zhi-Qiu, Huang,Fang K,Kun, Fang,et al. Inefficient Cosmic-Ray Diffusion around Vela X: Constraints from HESS Observations of Very High-energy Electrons[J]. ASTROPHYSICAL JOURNAL,2018,866(2):143.
APA	Zhi-Qiu, Huang,方堃,Kun, Fang,Ruo-Yu, Liu,&Xiang-Yu, Wang.(2018).Inefficient Cosmic-Ray Diffusion around Vela X: Constraints from HESS Observations of Very High-energy Electrons.ASTROPHYSICAL JOURNAL,866(2),143.
MLA	Zhi-Qiu, Huang,et al."Inefficient Cosmic-Ray Diffusion around Vela X: Constraints from HESS Observations of Very High-energy Electrons".ASTROPHYSICAL JOURNAL 866.2(2018):143.