On the Gamma-Ray Nebula of Vela Pulsar. I. Very Slow Diffusion of Energetic Electrons within the TeV Nebula

doi:10.3847/1538-4357/ab1908

	On the Gamma-Ray Nebula of Vela Pulsar. I. Very Slow Diffusion of Energetic Electrons within the TeV Nebula
	Bao,Yiwei 1; Liu,Siming2,3 ; Chen,Yang 1,4
刊名	The Astrophysical Journal
	2019-05-24
卷号	877 期号:1
关键词	cosmic rays diffusion ISM: individual objects (Vela X) ISM: supernova remnants
ISSN号	0004-637X
DOI	10.3847/1538-4357/ab1908
英文摘要	Abstract 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.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-637X-877-1-AB1908
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/26733]
专题	中国科学院紫金山天文台
作者单位	1.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
推荐引用方式 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).