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On the Gamma-Ray Nebula of Vela Pulsar. I. Very Slow Diffusion of Energetic Electrons within the TeV Nebula
Bao,Yiwei1; Liu,Siming2,3; Chen,Yang1,4
2019-05-24
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume877Issue:1
AbstractAbstract High-energy particle transport in pulsar wind nebulae (PWNe) plays an essential role in explaining the characteristics revealed in multiwavelength observations. In this paper, the TeV–gamma-ray-emitting electrons in the Vela X PWN are approximated to be injected impulsively when the cocoon is formed due to the interaction between the SNR reverse shock and the PWN. By solving the diffusion-loss equation analytically, we reproduce the broadband spectral energy distribution and surface brightness profile simultaneously. The diffusion coefficient of TeV electrons and positrons, which is well constrained by the spectral and spatial properties of the TeV nebula, is thus determined to be 1?×?1026 cm2 s?1 for 10 TeV electrons and positrons. This coefficient is more than three orders of magnitude lower than that in the interstellar medium, in agreement with a constraint recently obtained from HAWC observations of a TeV nebula associated with the Geminga pulsar. These results suggest that slow diffusion of high-energy particles might be common in PWNe.
Keywordcosmic rays diffusion ISM: individual objects (Vela X) ISM: supernova remnants
DOI10.3847/1538-4357/ab1908
Language英语
WOS IDIOP:0004-637X-877-1-ab1908
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/26734
Collection中国科学院紫金山天文台
Affiliation1.Department of Astronomy, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, People's Republic of China
2.Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210034, People's Republic of China
3.School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026, People's Republic of China; liusm@pmo.ac.cn
4.Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University, Ministry of Education, Nanjing, People's Republic of China; ygchen@nju.edu.cn
Recommended Citation
GB/T 7714
Bao,Yiwei,Liu,Siming,Chen,Yang. On the Gamma-Ray Nebula of Vela Pulsar. I. Very Slow Diffusion of Energetic Electrons within the TeV Nebula[J]. The Astrophysical Journal,2019,877(1).
APA Bao,Yiwei,Liu,Siming,&Chen,Yang.(2019).On the Gamma-Ray Nebula of Vela Pulsar. I. Very Slow Diffusion of Energetic Electrons within the TeV Nebula.The Astrophysical Journal,877(1).
MLA Bao,Yiwei,et al."On the Gamma-Ray Nebula of Vela Pulsar. I. Very Slow Diffusion of Energetic Electrons within the TeV Nebula".The Astrophysical Journal 877.1(2019).
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