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arXiv 2110.07643astro-ph.GAastro-ph.CO
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由点质量II透镜的FRB。从微透镜的观点看多峰FRB

FRBs Lensed by Point Masses II. The multi-peaked FRBs from the point view of microlensing

Xuechun Chen, Yiping Shu, Guoliang Li, Wenwen Zheng

摘要:

微透镜效应已经发展成为一种强大的技术,用于各种应用,包括系外行星的发现,银河系的结构,对大质量致密晕天体的约束,以及类星体吸积盘的大小和轮廓的测量。在本文中,我们考虑了一种特殊类型的微透镜事件的源是快速射电暴与$\sim$毫秒(ms)的持续时间,透镜和源之间的相对运动是可以忽略的。在这种情况下,可以在时间上解析各个微图像。因此,需要一种超越逆射线拍摄(IRS)方法的方法,该方法仅评估所有显微图像的总放大率。因此,我们实现了一个算法,用于识别个人的显微图像和计算它们的放大率和相对时间延迟。我们验证我们的算法通过比较分析预测一个单一的微透镜的情况下,找到很好的协议。我们表明,从个人的显微图像的脉冲叠加产生的光变曲线,出现多峰FRB。对于恒星质量透镜,脉冲之间的相对时间延迟可以达到0.1- 1毫秒,因此已经可以通过现有设施在时间上分辨。虽然还没有发现,微透镜的FRB将成为定期事件,并超过类星体微透镜事件的数量在不久的将来时,$10^{4-5}$ FRB预计将被发现在日常的基础上。我们的算法提供了一种生成微透镜光变曲线的方法,可用于约束遥远星系中的恒星质量分布。

英文摘要:

The microlensing effect has developed into a powerful technique for a diverse range of applications including exoplanet discoveries, structure of the Milky Way, constraints on MAssive Compact Halo Objects, and measurements of the size and profile of quasar accretion discs. In this paper, we consider a special type of microlensing events where the sources are fast radio bursts with $\sim$milliseconds (ms) durations for which the relative motion between the lens and source is negligible. In this scenario, it is possible to temporally resolve the individual microimages. As a result, a method beyond the inverse ray shooting (IRS) method, which only evaluates the total magnification of all microimages, is needed. We therefore implement an algorithm for identifying individual microimages and computing their magnifications and relative time delays. We validate our algorithm by comparing to analytical predictions for a single microlens case and find excellent agreement. We show that the superposition of pulses from individual microimages produces a light curve that appears as multi-peaked FRBs. The relative time delays between pulses can reach 0.1--1 ms for stellar-mass lenses and hence can already be resolved temporally by current facilities. Although not yet discovered, microlensing of FRBs will become regular events and surpass the number of quasar microlensing events in the near future when $10^{4-5}$ FRBs are expected to be discovered on a daily basis. Our algorithm provides a way of generating the microlensing light curve that can be used for constraining stellar mass distribution in distant galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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