Oguri Masamune, Miyazaki Satoshi
Center for Frontier Science, Chiba University, Inage-ku, Chiba, Japan.
Department of Physics, Graduate School of Science, Chiba University, Inage-Ku, Chiba, Japan.
Proc Jpn Acad Ser B Phys Biol Sci. 2025;101(3):129-142. doi: 10.2183/pjab.101.010.
Clusters of galaxies can be identified from the peaks in weak lensing aperture mass maps constructed from weak lensing shear catalogs. Such purely gravitational cluster selection differs considerably from traditional cluster selection based on the baryonic properties of clusters. In this review, we present the basics and applications of weak lensing shear-selected cluster samples. Detailed studies of the baryonic properties of shear-selected clusters shed new light on cluster astrophysics. The purely gravitational selection indicates that the selection function can be quantified more easily and robustly, which is crucial for deriving accurate cosmological constraints from the abundance of shear-selected clusters. Recent advances in shear-selected cluster studies are driven by the Subaru Hyper Suprime-Cam survey, in which more than 300 shear-selected clusters with a signal-to-noise ratio ＞ 5 were identified. It is argued that various systematic effects in cosmological analysis can be mitigated by carefully selecting the setup of the analysis, including the selection of kernel functions and the source galaxy sample.
星系团可以从由弱引力透镜切变目录构建的弱引力透镜孔径质量图的峰值中识别出来。这种纯粹基于引力的星系团选择与基于星系团重子性质的传统星系团选择有很大不同。在这篇综述中，我们介绍了弱引力透镜切变选择的星系团样本的基础知识和应用。对切变选择的星系团重子性质的详细研究为星系团天体物理学带来了新的启示。纯粹基于引力的选择表明，选择函数可以更轻松、更稳健地进行量化，这对于从大量切变选择的星系团中得出准确的宇宙学限制至关重要。切变选择的星系团研究的最新进展是由斯巴鲁超新星相机（Subaru Hyper Suprime-Cam）调查推动的，在该调查中，识别出了300多个信噪比＞5的切变选择星系团。有人认为，通过仔细选择分析设置，包括内核函数的选择和源星系样本，可以减轻宇宙学分析中的各种系统效应。
