脉冲星辐射被光二进制中的等离子镜片放大和分辨
Robert Main1,2,3, I-Sheng Yang4,5, Victor Chan6
1Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON, Canada. main@astro.utoronto.ca.
Nature
|May 26, 2018
概括
无线电脉冲星作为宇宙镜头, 允许天文学家解决它们的发射区域. 黑寡妇脉冲星B1957+20中的极端等离子透镜事件揭示了脉冲星发射的细节,并支持快速无线电爆发的理论.
科学领域:
- * 天体物理学
- * 无线电天文学
- *等离子体物理
背景情况:
- * 无线电脉冲星由于通过电离星际介质传播而呈现闪.
- *星际闪区域可以作为"星际透镜"用于定位脉冲辐射.
- * 之前的研究仅在边际解决了排放成分,限制了推断.
研究的目的:
- * 为了研究黑寡妇脉冲星 (B1957+20) 的极端等离子透镜事件.
- * 利用这些透镜事件对脉冲星发射区域进行高分辨率成像.
- * 探索对快速无线电爆发 (FRB) 的理解的影响.
主要方法:
- * 在轨道日食阶段观测黑寡妇脉冲星B1957+20.
- 在极端等离子透镜事件中对射流增强的分析.
- * 通过透镜传递的依赖频率结构的特征.
主要成果:
- * 观察到极端的等离子透镜事件,其无线电流增强率高达70 - 80倍.
- *已确定脉冲星发射区域,区分主脉冲和间脉冲.
- * 推断的透镜分辨率与脉冲星半径相当 (约10公里).
- *发现频率结构类似于FRB 121102中观察到的频率结构.
结论:
- 在B1957+20中极端的等离子透镜是由于伴侣外流的密度波动而自然产生的.
- * 观察到的透镜为FRB的"星际透镜"模型提供了强有力的证据.
- 这项研究表明了等离子透镜对高分辨率脉冲星系的潜力.
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