On the Time–Frequency Downward Drifting of Repeating Fast Radio Bursts
文献类型：期刊论文
| 作者 | Wang,Weiyang5,6,7; Zhang,Bing4; Chen,Xuelei3,6,7 ; Xu,Renxin1,2,5
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| 刊名 | The Astrophysical Journal Letters
 |
| 出版日期 | 2019-05-03 |
| 卷号 | 876期号:1 |
| ISSN号 | 2041-8205 |
| 关键词 | pulsars: general radiation mechanisms: non-thermal radio continuum: general stars: neutron |
| DOI | 10.3847/2041-8213/ab1aab |
| 英文摘要 | Abstract The newly discovered second repeating fast radio burst (FRB) source, FRB 180814.J0422+73, was reported to exhibit a time–frequency downward drifting pattern, which is also seen in the first repeater FRB 121102. We propose a generic geometrical model to account for the observed downward drifting of sub-pulse frequency, within the framework of coherent curvature radiation by bunches of electron–positron pairs in the magnetosphere of a neutron star (NS). A sudden trigger event excites these coherent bunches of charged particles, which stream outward along open field lines. As the field lines sweep across the line of sight, the bunches seen later travel farther into the less-curved part of the magnetic field lines, thus emitting at lower frequencies. We use this model to explain the time–frequency downward drifting in two FRB generation scenarios, the transient pulsar-like sparking from the inner gap region of a slowly rotating NS, and the externally triggered magnetosphere reconfiguration known as the “cosmic comb.” |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:2041-8205-876-1-AB1AAB |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/28902]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People’s Republic of China 2.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China 3.Center for High Energy Physics, Peking University, Beijing 100871, People’s Republic of China 4.Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154, USA; zhang@physics.unlv.edu 5.School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People’s Republic of China 6.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 7.Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100101, People’s Republic of China; wywang@bao.ac.cn |
| 推荐引用方式 GB/T 7714 | Wang,Weiyang,Zhang,Bing,Chen,Xuelei,et al. On the Time–Frequency Downward Drifting of Repeating Fast Radio Bursts[J]. The Astrophysical Journal Letters,2019,876(1). |
| APA | Wang,Weiyang,Zhang,Bing,Chen,Xuelei,&Xu,Renxin.(2019).On the Time–Frequency Downward Drifting of Repeating Fast Radio Bursts.The Astrophysical Journal Letters,876(1). |
| MLA | Wang,Weiyang,et al."On the Time–Frequency Downward Drifting of Repeating Fast Radio Bursts".The Astrophysical Journal Letters 876.1(2019). |
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来源：国家天文台
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