GeV Observations of the Extended Pulsar Wind Nebulae Constrain the Pulsar Interpretations of the Cosmic-Ray Positron Excess
文献类型：期刊论文
| 作者 | Xi,Shao-Qiang3,4; Wang,Xiang-Yu3,4; Fang,Kun1 ; Huang,Zhi-Qiu3,4; Liu,Ruo-Yu2
|
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2019-06-19 |
| 卷号 | 878期号:2 |
| 关键词 | cosmic rays |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab20c9 |
| 英文摘要 | Abstract It has long been suggested that nearby pulsars within ～1 kpc are the leading candidate of the 10–500 GeV cosmic-ray positron excess measured by PAMELA and other experiments. The recent measurement of the surface brightness profile of TeV nebulae surrounding Geminga and PSR?B0656+14 by the High-Altitude Water Cherenkov Observatory (HAWC) suggests inefficient diffusion of particles from the sources, giving rise to a debate on the pulsar interpretation of the cosmic-ray positron excess. Here we argue that GeV observations provide more direct constraints on the positron density in the TeV nebulae in the energy range of 10–500 GeV and hence on the origin of the observed positron excess. Motivated by this, we search for GeV emission from the TeV nebulae with the Fermi Large Area Telescope (LAT). No spatially extended GeV emission is detected from these two TeV nebulae in the framework of two-zone diffusion spatial templates, suggesting a relatively low density of GeV electrons/positrons in the TeV nebulae. A joint modeling of the data from HAWC and Fermi-LAT disfavors Geminga and PSR?B0656+14 as the dominant sources of the positron excess at ～50–500 GeV for the usual Kolmogorov-type diffusion, while for an energy-independent diffusion, a dominant part of the positron excess contributed by them cannot be ruled out by the current data. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-878-2-AB20C9 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/282390]  |
| 专题 | 中国科学院高能物理研究所 |
| 作者单位 | 1.Key laboratory of Modern Astronomy and Astrophysics, Nanjing University, Ministry of Education, Nanjing 210093, People’s Republic of China 2.Deutsches Elektronen-Synchrotron (DESY), Platanenallee 6, D-15738 Zeuthen, Germany; ruoyu.liu@desy.de 3.Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 4.School of Astronomy and Space Science, Nanjing University, Nanjing 210023, People’s Republic of China; xywang@nju.edu.cn |
| 推荐引用方式 GB/T 7714 | Xi,Shao-Qiang,Wang,Xiang-Yu,Fang,Kun,et al. GeV Observations of the Extended Pulsar Wind Nebulae Constrain the Pulsar Interpretations of the Cosmic-Ray Positron Excess[J]. The Astrophysical Journal,2019,878(2). |
| APA | Xi,Shao-Qiang,Wang,Xiang-Yu,Fang,Kun,Huang,Zhi-Qiu,&Liu,Ruo-Yu.(2019).GeV Observations of the Extended Pulsar Wind Nebulae Constrain the Pulsar Interpretations of the Cosmic-Ray Positron Excess.The Astrophysical Journal,878(2). |
| MLA | Xi,Shao-Qiang,et al."GeV Observations of the Extended Pulsar Wind Nebulae Constrain the Pulsar Interpretations of the Cosmic-Ray Positron Excess".The Astrophysical Journal 878.2(2019). |
入库方式： OAI收割
来源：高能物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。