模拟快速射电暴形态及其相干相位相关特征的多平面天体物理透镜效应
Simulating FRB Morphologies and Coherent Phase Correlation Signatures from Multi-Plane Astrophysical Lensing
AI总结：
本文提出一种模拟工具，通过相位相干几何光学生成多平面透镜效应，研究快速射电暴的形态和相干相位特征，展示其在建模射电暴透镜形态和观测相位相干性方面的应用。
摘要：
快速射电暴（FRBs）如同脉冲星，其无线电发射来自紧凑区域，可视为点源。当这些辐射传播时，会遇到引力场或冷等离子体中电子密度不均匀变化等透镜效应。我们开发了一个模拟工具，通过相位相干几何光学在空间网格上生成这些透镜形态。在极限情况下，FRB可视为点源，其射线路径具有相位相干性。每个图像将有时间延迟和放大率，改变发射的频率-时间形态以适应观测到的形态。这些图像的干涉可能使观测到的相位特性失相干，影响任何与相位相关的搜索，如搜索观测到的FRB电压与其他图像在时间上的自相关性。我们提供分析测试案例以展示该模拟能够建模定性属性。我们提供多平面透镜系统示例，以展示该模拟在建模射电暴透镜形态和观测相位相干性方面的应用。
英文摘要：
Fast Radio Bursts (FRBs), like pulsars, display radio emission from compact regions such that they can be treated as point sources. As this radiation propagates through space, they encounter sources of lensing such as a gravitational field of massive objects or inhomogeneous changes in the electron density of cold plasma. We have developed a simulation tool to generate these lensing morphologies through coherent propagation transfer functions generated by phase coherent geometric optics on a spatial grid. In the limit an FRB can be treated as a point source, the ray paths from the FRB to the observer are phase coherent. Each image will have a time delay and magnification that will alter the emitted frequency-temporal morphology of the FRB to that which is observed. The interference of these images could also decohere the observed phase properties of the images, affecting any phase related searches such as searching for the auto-correlation of the observed FRB voltage with other images in time. We present analytic test cases to demonstrate that the simulation can model qualitative properties. We provide example multi-plane lensing systems to show the capabilities of the simulation in modeling the lensed morphology of an FRB and observed phase coherence.
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