Inefficient Cosmic-Ray Diffusion around Vela X: Constraints from HESS Observations of Very High-energy Electrons
文献类型：期刊论文
| 作者 | Kun, Fang; Ruo-Yu, Liu; Xiang-Yu, Wang; Fang K(方堃) ; Zhi-Qiu, Huang
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| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018 |
| 卷号 | 866期号:2页码:143 |
| 关键词 | cosmic rays |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aadfed |
| 文献子类 | Article |
| 英文摘要 | 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. |
| 电子版国际标准刊号 | 1538-4357 |
| WOS关键词 | PULSAR WIND NEBULA ; GAMMA-RAYS ; PROTONS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000448201700008 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/286791]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 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 | Kun, Fang,Ruo-Yu, Liu,Xiang-Yu, Wang,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 | Kun, Fang,Ruo-Yu, Liu,Xiang-Yu, Wang,方堃,&Zhi-Qiu, Huang.(2018).Inefficient Cosmic-Ray Diffusion around Vela X: Constraints from HESS Observations of Very High-energy Electrons.ASTROPHYSICAL JOURNAL,866(2),143. |
| MLA | Kun, Fang,et al."Inefficient Cosmic-Ray Diffusion around Vela X: Constraints from HESS Observations of Very High-energy Electrons".ASTROPHYSICAL JOURNAL 866.2(2018):143. |
入库方式： OAI收割
来源：高能物理研究所
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