用FIGARO堆叠同步加速器宇宙网
Stacking the Synchrotron Cosmic Web with FIGARO
摘要：
最近，Vernstrom等人（2021）声称首次明确检测到同步加速器宇宙网，通过在低频射电观测中“堆叠”数十万对近距离星团并寻找跨越星团内桥的剩余多余信号来获得。Hodgson等人（2022年）使用原始无线电数据以及Murchison Widefield Array的新观测结果进行的复制研究未能证实这些发现。虽然检测仍然不确定，但我们在这里转向堆叠模拟无线电天空，以了解我们目前最好的同步加速器宇宙网宇宙学模型预测的多余无线电信号。我们使用FIlaments & GAlactic Radio（Hodgson等人，2021 a）模拟，它模拟了同步加速器宇宙网以及各种活动星系核和恒星形成星系的亚型。作为一个模拟，我们对我们在自己的堆叠实验中使用的星系团和星系群的位置有着完美的了解。虽然我们确实在我们的堆栈中发现了可归因于同步加速器宇宙网的多余无线电签名，但它的分布与Vernstrom等人发现的非常不同。相反，我们观察到的外观上的集群对直接内部的不对称的，“无线电遗迹”般的冲击周围的集群核心，而多余的发射跨越集群内区域-归因于细丝适当-是两个数量级低，在我们的实验中，即使在理想条件下也无法检测到。
英文摘要：
Recently Vernstrom et al. (2021) claimed the first definitive detection of the synchrotron cosmic web, obtained by `stacking' hundreds of thousands of pairs of close-proximity clusters in low-frequency radio observations and looking for a residual excess signal spanning the intracluster bridge. A reproduction study by Hodgson et al. (2022), using both the original radio data as well as new observations with the Murchison Widefield Array, failed to confirm these findings. Whilst the detection remains unsure, we here turn to stacking a simulated radio sky to understand what kind of excess radio signal is predicted by our current best cosmological models of the synchrotron cosmic web. We use the FIlaments & GAlactic RadiO (Hodgson et al., 2021a) simulation, which models both the synchrotron cosmic web as well as various subtypes of active galactic nucleii and star forming galaxies. Being a simulation, we have perfect knowledge of the location of clusters and galaxy groups which we use in our own stacking experiment. Whilst we do find an excess radio signature in our stacks that is attributable to the synchrotron cosmic web, its distribution is very different to that found by Vernstrom et al. (2021). Instead, we observe the appearance of excess emission on the immediate interiors of cluster pairs as a result of asymmetric, `radio relic'-like shocks surrounding cluster cores, whilst the excess emission spanning the intracluster region -- attributable to filaments proper -- is two orders of magnitude lower and undetectable in our experiment even under ideal conditions.
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