Deep Synoptic Array Science: Two Fast Radio Burst Sources in Massive Galaxy Clusters
Deep Synoptic Array Science: Two Fast Radio Burst Sources in Massive Galaxy Clusters
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DOI：
10.3847/2041-8213/acd3ea
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发表时间：
2023-02
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通讯作者：
L. Connor;V. Ravi;M. Catha;G. Chen;J. Faber;J. Lamb;G. Hallinan;Charlie Harnach;G. Hellbourg;Richard Hobbs;David Hodge;M. Hodges;C. Law;Paul Rasmussen;J. Sayers;Kritti Sharma;M. Sherman;Jun Shi;D. Simard;J. Somalwar;Reynier Squillace;S. Weinreb;D. Woody;N. Yadlapalli
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作者：
L. Connor;V. Ravi;M. Catha;G. Chen;J. Faber;J. Lamb;G. Hallinan;Charlie Harnach;G. Hellbourg;Richard Hobbs;David Hodge;M. Hodges;C. Law;Paul Rasmussen;J. Sayers;Kritti Sharma;M. Sherman;Jun Shi;D. Simard;J. Somalwar;Reynier Squillace;S. Weinreb;D. Woody;N. Yadlapalli
组成星系团内介质(ICM)的热气体在X射线和毫米/亚毫米波段(Sunyaev-Zel‘dovich效应)已经研究了几十年。快速射电爆发(FRB)提供了一种通过色散测量(DM)和法拉第旋转测量等观测值直接测量ICM和星团周围气体的方法。我们报道了用深天像阵列探测到的两个FRB源，它们的宿主星系属于大质量星系团。在这两种情况下，FRB都表现出过量的河外DM，其中一些可能起源于各自星系团的ICM。FRB 20220914A位于星系团A2310中，z=0.1125，距星系团中心的投影偏移量为520±50kpc。第二个源FRB20220509G的宿主是一个z=0.0894的椭圆星系，它属于星系团A2311，投影偏移量为870±50kpc。这些源代表了FRB第一次被定位到一个星系团。我们将FRB数据与档案X射线、Sunyaev-Zel‘dovich(SZ)和这些星系团的光学观测相结合，以推断ICM的性质，包括从Dm和y SZ测量0.8-3.9keV的气体温度。然后，我们将我们的结果与IllustrisTNG模拟得到的大质量星系团光晕进行比较。最后，我们描述了来自未来调查的局部化FRB的大样本将如何限制ICM，特别是超出星系团的维里半径。
The hot gas that constitutes the intracluster medium (ICM) has been studied at X-ray and millimeter/submillimeter wavelengths (Sunyaev–Zel’dovich 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. We report the discovery of two FRB sources detected with the Deep Synoptic Array whose host galaxies belong to massive galaxy clusters. In both cases, the FRBs exhibit excess extragalactic DM, some of which likely originate in the ICM of their respective clusters. FRB 20220914A resides in the galaxy cluster A2310 at z = 0.1125 with a projected offset from the cluster center of 520 ± 50 kpc. The host of a second source, FRB 20220509G, is an elliptical galaxy at z = 0.0894 that belongs to the galaxy cluster A2311 at the projected offset of 870 ± 50 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, Sunyaev–Zel'dovich (SZ), and optical observations of these clusters in order to infer properties of the ICM, including a measurement of gas temperature from DM and y SZ 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.