标题： 深度综合阵列科学：两个位于巨大星系团中的快速射电暴源 显示英文标题

标题： Deep Synoptic Array science: Two fast radio burst sources in massive galaxy clusters

摘要： 构成星系团际介质（ICM）的高温气体已在X射线和毫米/亚毫米波段（Sunyaev-Zeldovich效应）上研究了几十年。 快速射电暴（FRBs）提供了一种直接测量ICM和星系团周围气体的新方法，通过诸如色散度（DM）和法拉第旋转度（RM）等可观测量。 我们报告了使用Deep Synoptic阵列（DSA-110）发现的两个FRB源，其宿主星系属于大质量星系团。 在这两种情况下，FRBs表现出额外的星系际DM，其中一些可能起源于它们各自所属的星系团的ICM。 FRB 20220914A位于红移z=0.1125的Abell 2310星系团中，距离星系团中心投影偏移520 kpc。 第二个源FRB 20220509G的宿主是一颗红移z=0.0894的椭圆星系，属于投影偏移870 kpc的Abell 2311星系团。 这些源代表了首次将FRB定位到星系团。 我们将我们的FRB数据与这些星系团的档案X射线、SZ和光学观测相结合，以推断ICM的性质，包括从DM和ySZ测量得到的气体温度为0.8-3.9 keV。 然后我们将结果与IllustrisTNG模拟中的大质量星系团晕进行比较。 最后，我们描述了未来调查中的大量局部化FRB样本如何限制ICM，特别是在星系团的引力半径之外。 显示英文摘要

摘要： The hot gas that constitutes the intracluster medium (ICM) has been studied at X-ray and millimeter/sub-millimeter wavelengths (Sunyaev-Zeldovich effect) for decades. Fast radio bursts (FRBs) offer an additional method of directly measuring the ICM and gas surrounding clusters, via observables such as dispersion measure (DM) and Faraday rotation measure (RM). We report the discovery of two FRB sources detected with the Deep Synoptic Array (DSA-110) whose host galaxies belong to massive galaxy clusters. In both cases, the FRBs exhibit excess extragalactic DM, some of which likely originates in the ICM of their respective clusters. FRB 20220914A resides in the galaxy cluster Abell 2310 at z=0.1125 with a projected offset from the cluster center of 520 kpc. The host of a second source, FRB 20220509G, is an elliptical galaxy at z=0.0894 that belongs to the galaxy cluster Abell 2311 at projected offset of 870 kpc. These sources represent the first time an FRB has been localized to a galaxy cluster. We combine our FRB data with archival X-ray, SZ, and optical observations of these clusters in order to infer properties of the ICM, including a measurement of gas temperature from DM and ySZ of 0.8-3.9 keV. We then compare our results to massive cluster halos from the IllustrisTNG simulation. Finally, we describe how large samples of localized FRBs from future surveys will constrain the ICM, particularly beyond the virial radius of clusters.