Bunching Coherent Curvature Radiation in Three-dimensional Magnetic Field Geometry: Application to Pulsars and Fast Radio Bursts
文献类型：期刊论文
| 作者 | Yang, Yuan-Pei1,4; Zhang, Bing1,2,3,4 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2018-11-20 |
| 卷号 | 868期号:1页码:29 |
| ISSN号 | 0004-637X |
| 关键词 | radiation mechanisms: non-thermal radio continuum: general |
| DOI | 10.3847/1538-4357/aae685 |
| 英文摘要 | The extremely high brightness temperatures of pulsars and fast radio bursts (FRBs) require their radiation mechanisms to be coherent. Coherent curvature radiation from bunches has been long discussed as the mechanism for radio pulsars and recently for FRBs. Assuming that bunches are already generated in pulsar magnetospheres, we calculate the spectrum of coherent curvature radiation under a three-dimensional magnetic field geometry. Different from previous works assuming parallel trajectories and a monoenergetic energy distribution of electrons, we consider a bunch characterized by its length, curvature radius of the trajectory family, bunch opening angle, and electron energy distribution. We find that the curvature radiation spectra of the bunches are characterized by a multisegment broken power law, with the break frequencies depending on bunch properties and trajectory configuration. We also emphasize that in a pulsar magnetosphere, only the fluctuation of net charges with respect to the background (Goldreich-Julian) outflow can make a contribution to coherent radiation. We apply this model to constrain the observed spectra of pulsars and FRBs. For a typical pulsar (B-p = 10(12) G, P = 0.1 s), a small fluctuation of the net charge delta n(GJ) similar to 0.1n(GJ) can provide the observable flux. For FRBs, the fluctuating net charge may be larger due to its abrupt nature. For delta n(GJ) similar to n(GJ), a neutron star with a strong magnetic field and fast rotation is required to power an FRB in the spindown-powered model. The requirement is less stringent in the cosmic comb model thanks to the larger cross section and compressed charge density of the bunch made by the external astrophysical stream that combs the magnetosphere. |
| WOS关键词 | 2-STREAM INSTABILITY ; RELATIVISTIC PLASMA ; GENERAL-THEORY ; CRAB PULSAR ; POLAR GAPS ; FRB 121102 ; INNER-GAP ; EMISSION ; MODEL ; MAGNETOSPHERES |
| 资助项目 | National Basic Research Program (973 Program) of China[2014CB845800] ; China Postdoctoral Science Foundation[2016M600851] ; KIAA-CAS Fellowship ; [BX201600003] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000450221800031 |
| 资助机构 | National Basic Research Program (973 Program) of China ; National Basic Research Program (973 Program) of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; KIAA-CAS Fellowship ; KIAA-CAS Fellowship ; National Basic Research Program (973 Program) of China ; National Basic Research Program (973 Program) of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; KIAA-CAS Fellowship ; KIAA-CAS Fellowship ; National Basic Research Program (973 Program) of China ; National Basic Research Program (973 Program) of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; KIAA-CAS Fellowship ; KIAA-CAS Fellowship ; National Basic Research Program (973 Program) of China ; National Basic Research Program (973 Program) of China ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; KIAA-CAS Fellowship ; KIAA-CAS Fellowship |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/23330]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Yang, Yuan-Pei |
| 作者单位 | 1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA 3.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China 4.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yang, Yuan-Pei,Zhang, Bing. Bunching Coherent Curvature Radiation in Three-dimensional Magnetic Field Geometry: Application to Pulsars and Fast Radio Bursts[J]. ASTROPHYSICAL JOURNAL,2018,868(1):29. |
| APA | Yang, Yuan-Pei,&Zhang, Bing.(2018).Bunching Coherent Curvature Radiation in Three-dimensional Magnetic Field Geometry: Application to Pulsars and Fast Radio Bursts.ASTROPHYSICAL JOURNAL,868(1),29. |
| MLA | Yang, Yuan-Pei,et al."Bunching Coherent Curvature Radiation in Three-dimensional Magnetic Field Geometry: Application to Pulsars and Fast Radio Bursts".ASTROPHYSICAL JOURNAL 868.1(2018):29. |
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来源：国家天文台
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