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DOI | 10.1038/nature21389 |
Pulsar emission amplified and resolved by plasma lensing in an eclipsing binary | |
Main, Robert1,2,3; Yang, I-Sheng3,4; Chan, Victor1; Li, Dongzi3,5; Lin, Fang Xi3,5; Mahajan, Nikhil1; Pen, Ue-Li2,3,4,6; Vanderlinde, Keith1,2; van Kerkwijk, Marten H.1 | |
2018-05-24 | |
发表期刊 | NATURE |
ISSN | 0028-0836 |
EISSN | 1476-4687 |
出版年 | 2018 |
卷号 | 557期号:7706页码:522-+ |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | Radio pulsars scintillate because their emission travels through the ionized interstellar medium along multiple paths, which interfere with each other. It has long been realized that, independent of their nature, the regions responsible for the scintillation could be used as 'interstellar lenses' to localize pulsar emission regions(1,2). Most such lenses, however, resolve emission components only marginally, limiting results to statistical inferences and detections of small positional shifts(3-5). As lenses situated close to their source offer better resolution, it should be easier to resolve emission regions of pulsars located in high-density environments such as supernova remnants(6) or binaries in which the pulsar's companion has an ionized outflow. Here we report observations of extreme plasma lensing in the 'black widow' pulsar, B1957+20, near the phase in its 9.2-hour orbit at which its emission is eclipsed by its companion's outflow(7-9). During the lensing events, the observed radio flux is enhanced by factors of up to 70-80 at specific frequencies. The strongest events clearly resolve the emission regions: they affect the narrow main pulse and parts of the wider interpulse differently. We show that the events arise naturally from density fluctuations in the outer regions of the outflow, and we infer a resolution of our lenses that is comparable to the pulsar's radius, about 10 kilometres. Furthermore, the distinct frequency structures imparted by the lensing are reminiscent of what is observed for the repeating fast radio burst FRB 121102, providing observational support for the idea that this source is observed through, and thus at times strongly magnified by, plasma lenses(10). |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000432794900039 |
WOS关键词 | FAST RADIO-BURST ; FRB 121102 ; MILLISECOND PULSAR ; HOST GALAXY ; ASTROMETRY ; MECHANISMS |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/202707 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Toronto, Dept Astron & Astrophys, Toronto, ON, Canada; 2.Univ Toronto, Dunlap Inst Astron & Astrophys, Toronto, ON, Canada; 3.Univ Toronto, Canadian Inst Theoret Astrophys, Toronto, ON, Canada; 4.Perimeter Inst Theoret Phys, Waterloo, ON, Canada; 5.Univ Toronto, Dept Phys, Toronto, ON, Canada; 6.Canadian Inst Adv Res, Toronto, ON, Canada |
推荐引用方式 GB/T 7714 | Main, Robert,Yang, I-Sheng,Chan, Victor,et al. Pulsar emission amplified and resolved by plasma lensing in an eclipsing binary[J]. NATURE,2018,557(7706):522-+. |
APA | Main, Robert.,Yang, I-Sheng.,Chan, Victor.,Li, Dongzi.,Lin, Fang Xi.,...&van Kerkwijk, Marten H..(2018).Pulsar emission amplified and resolved by plasma lensing in an eclipsing binary.NATURE,557(7706),522-+. |
MLA | Main, Robert,et al."Pulsar emission amplified and resolved by plasma lensing in an eclipsing binary".NATURE 557.7706(2018):522-+. |
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