Stellar prospects for FRB gravitational lensing
Stellar prospects for FRB gravitational lensing
复制标题
FRB 引力透镜的美好前景
DOI：
10.1093/mnras/stad667
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发表时间：
2023
影响因子：
4.8
通讯作者：
Ravi, Vikram
中科院分区：
文献类型：
--
作者：
Connor, Liam;Ravi, Vikram
快速射电爆发(FRB)的引力透镜效应为几种宇宙学应用提供了一条令人兴奋的途径。然而，目前还不清楚未来的调查会发现多少这样的事件，也不清楚如何以最佳方式找到它们。我们使用FRB的已知性质来预测引力透镜在从微秒到数年的延迟时间尺度上的探测率，对应于透镜质量跨越15个数量级。我们强调了FRB红移分布对我们观察引力透镜的能力的作用。我们考虑了前景星系中恒星对FRB的宇宙学透镜效应，并表明强烈的恒星透镜效应将在微秒时间尺度上占主导地位。即将到来的探测，如DSA-2000和Chord，将限制致密天体(如原始黑洞)中暗物质的比例，并可能探测到来自中等质量黑洞(IMBH)或小型暗物质晕的毫秒感应事件。除了短时间尺度的透镜，相干的全天监视器将能够探测到来自大质量星系的持续时间更长的透镜事件。最后，我们提出了FRB引力透镜的一种新的应用，它将直接测量中间星系的环星系介质。
Gravitational lensing of fast radio bursts (FRBs) offers an exciting avenue for several cosmological applications. However, it is not yet clear how many such events future surveys will detect nor how to optimally find them. We use the known properties of FRBs to forecast detection rates of gravitational lensing on delay time-scales from microseconds to years, corresponding to lens masses spanning 15 orders of magnitude. We highlight the role of the FRB redshift distribution on our ability to observe gravitational lensing. We consider cosmological lensing of FRBs by stars in foreground galaxies and show that strong stellar lensing will dominate on microsecond time-scales. Upcoming surveys such as DSA-2000 and CHORD will constrain the fraction of dark matter in compact objects (e.g. primordial black holes) and may detect millilensing events from intermediate mass black holes (IMBHs) or small dark matter halos. Coherent all-sky monitors will be able to detect longer-duration lensing events from massive galaxies, in addition to short time-scale lensing. Finally, we propose a new application of FRB gravitational lensing that will measure directly the circumgalactic medium of intervening galaxies.