Coherent Radio Emission from a Twisted Magnetosphere after a Magnetar-quake
文献类型：期刊论文
| 作者 | Wang,Weiyang2,3,4; Zhang,Bing5; Chen,Xuelei1,2,3 ; Xu,Renxin4,6
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2019-04-17 |
| 卷号 | 875期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | pulsars: general radiation mechanisms: non-thermal radio continuum: general stars: neutron |
| DOI | 10.3847/1538-4357/ab0e71 |
| 英文摘要 | Abstract Magnetars are a class of highly magnetized, slowly rotating neutron stars, only a small fraction of which exhibit radio emission. We propose that the coherent radio curvature emission is generated by net charge fluctuations from a twist-current-carrying bundle (the j-bundle) in the scenario of magnetar-quake. Two-photon pair production is triggered, which requires a threshold voltage not too much higher than 109 V in the current-carrying bundle, and which can be regarded as the “open field lines” of a magnetar. Continued untwisting of the magnetosphere maintains change fluctuations, and hence coherent radio emission, in the progressively shrinking j-bundle, which lasts for years until the radio beam is too small to be detected. The modeled peak flux of radio emission and the flat spectrum are generally consistent with the observations. We show that this time-dependent, conal-beam, radiative model can interpret the variable radio pulsation behaviors and the evolution of the X-ray hot spot of the radio-transient magnetar XTE J1810?197 and the high-B pulsar/anomalous X-ray pulsar PSR J1622?4950. Radio emission with luminosity of and high-frequency oscillations are expected to be detected for a magnetar after an X-ray outburst. Differences of radio emission between magnetars and ordinary pulsars are discussed. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-875-2-AB0E71 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/26034]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Center for High Energy Physics, Peking University, Beijing 100871, People’s Republic of China 2.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 3.University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 4.School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People’s Republic of China 5.Department of Physics and Astronomy, University of Nevada, Las Vegas, NV 89154, USA; zhang@physics.unlv.edu 6.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Wang,Weiyang,Zhang,Bing,Chen,Xuelei,et al. Coherent Radio Emission from a Twisted Magnetosphere after a Magnetar-quake[J]. The Astrophysical Journal,2019,875(2). |
| APA | Wang,Weiyang,Zhang,Bing,Chen,Xuelei,&Xu,Renxin.(2019).Coherent Radio Emission from a Twisted Magnetosphere after a Magnetar-quake.The Astrophysical Journal,875(2). |
| MLA | Wang,Weiyang,et al."Coherent Radio Emission from a Twisted Magnetosphere after a Magnetar-quake".The Astrophysical Journal 875.2(2019). |
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来源：国家天文台
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