在多相CGM中,通过亚粒子微云对闪的FRB进行折射透镜
Dylan L Jow1,2,3, Xiaohan Wu1, Ue-Li Pen1,2,3,4,5,6
1Canadian Institute for Theoretical Astrophysics, University of Toronto, Toronto, ON M5S 3H8, Canada.
概括
快速无线电爆发 (FRB) 可能会被星系光环中的冷气透镜化,产生多个图像. 这种透镜可以抑制观测到的闪,为研究银河系气体特性提供了新的途径.
科学领域:
- 天体物理学 天体物理学
- 宇宙等离子体物理学
背景情况:
- 环银河系介质 (CGM) 是银河系生态系统的关键组成部分.
- 预计CGM内部的电离冷气云块具有亚粒子结构.
- 银河系星际介质 (ISM) 中的等离子屏幕会对无线电信号产生闪效应.
研究的目的:
- 调查CGM中冷气云块对快速无线电爆发 (FRB) 的折射透镜效应.
- 分析CGM透镜和ISM闪对FRB信号的联合影响.
- 探索FRB闪观测如何限制CGM属性.
主要方法:
- 模拟CGM中微小的冷气云的折射透镜.
- 模拟CGM镜头和ISM闪在FRB视线上的联合效应.
- 将模型预测与当前FRB闪观测进行比较.
主要成果:
- CGM云块可以将FRB镜头转化为具有显著散射时间尺度的多个图像.
- 这些多重图像的形成抑制了来自银河系ISM观测到的闪.
- 目前的闪数据微弱地不利于拟议的冷气云小模型.
结论:
- FRB闪观测可能会限制CGM中冷气云的特性.
- 在CGM中,冷气的板状几何形状可能使类星体吸收数据与观测到的透镜信号的缺乏相协调.
- 需要进一步的研究才能充分理解CGM结构和FRB传播之间的相互作用.
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