Beyond the ultradeep frontier fields and legacy observations (BUFFALO): a high-resolution strong+weak-lensing view of Abell 370
Beyond the ultradeep frontier fields and legacy observations (BUFFALO): a high-resolution strong+weak-lensing view of Abell 370
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超越超深前沿领域和传统观测 (BUFFALO)：Abell 370 的高分辨率强弱透镜视图
DOI：
10.1093/mnras/stad1999
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发表时间：
2023
影响因子：
4.8
通讯作者：
Niemiec A
中科院分区：
文献类型：
--
作者：
Niemiec A
哈勃太空望远镜的财政计划布法罗提供了六个哈勃前沿星系团的扩展宽视场成像。在这里，我们提出了结合强和弱透镜分析的阿贝尔370，一个巨大的集群atz= 0.375。从6 arcmin × 6 arcmin布法罗视场中重建的总投影质量分布，我们获得了星团核心外大质量子结构的分布，并报告了总共7个候选者的存在，每个候选者的质量为1.5 × 1013 M <$。结合来自透镜效应的总质量分布与多波长数据，我们评估了每个候选子结构的物理意义，并得出结论，七个子结构候选者中有五个似乎是可靠的，并且阿贝尔370的质量分布沿沿着和东南方向延伸。虽然这一发现与以前的研究基本一致，但我们详细的空间重建为大集群中心半径的复杂质量分布提供了新的见解。我们探讨的集群核心的模型上的扩展质量重建的影响，特别是，我们试图从物理上解释一个重要的外部剪切组件的存在下，需要获得一个低的均方根分离模型预测和观察到的多个图像在集群核心的位置。子结构只能占到外部剪切振幅的一半，这表明需要更多的努力来完全取代它更多的物理驱动的质量组件。我们向公众提供所有使用的透镜数据以及不同的透镜型号。
TheHSTtreasury programme BUFFALO provides extended wide-field imaging of the sixHubble Frontier Fieldsgalaxy clusters. Here we present the combined strong and weak-lensing analysis of Abell 370, a massive cluster atz= 0.375. From the reconstructed total projected mass distribution in the 6 arcmin × 6 arcmin BUFFALO field-of-view, we obtain the distribution of massive substructures outside the cluster core and report the presence of a total of seven candidates, each with mass ∼5 × 1013M⊙. Combining the total mass distribution derived from lensing with multiwavelength data, we evaluate the physical significance of each candidate substructure, and conclude that five out of the seven substructure candidates seem reliable, and that the mass distribution in Abell 370 is extended along the north-west and south-east directions. While this finding is in general agreement with previous studies, our detailed spatial reconstruction provides new insights into the complex mass distribution at large cluster-centric radius. We explore the impact of the extended mass reconstruction on the model of the cluster core and in particular, we attempt to physically explain the presence of an important external shear component, necessary to obtain a low root-mean-square separation between the model-predicted and observed positions of the multiple images in the cluster core. The substructures can only account for up to half the amplitude of the external shear, suggesting that more effort is needed to fully replace it by more physically motivated mass components. We provide public access to all the lensing data used as well as the different lens models.