CoMaLit -- VI。堆叠关系中的内在散射。KiDS-DR3中的弱透镜AMICO星系团
CoMaLit -- VI. Intrinsic scatter in stacked relations. The weak lensing AMICO galaxy clusters in KiDS-DR3
摘要：
对星系团进行无偏和精确的质量标定是充分利用星系团作为宇宙学探测器的关键。弱透镜信号的叠加使我们能够测量可观测质量关系，直到质量较小的晕，而无需外推。我们提出了一个贝叶斯推断方法来约束堆叠分析中质量代理的内在分散性。堆叠数据的分散度基于分箱聚类的数量相对于单个分散度重新缩放。我们将此方法应用于在第三次千度巡天数据发布中使用AMICO算法探测到的星系团。结果证实了作为低散射质量代理的光学丰富度。根据光学丰富度和经过校准的弱透镜质量丰富度关系，可以估算出小至10^13太阳质量的单个天体的质量，精度约为20%。
英文摘要：
Unbiased and precise mass calibration of galaxy clusters is crucial to fully exploit galaxy clusters as cosmological probes. Stacking of weak lensing signal allows us to measure observable-mass relations down to less massive halos halos without extrapolation. We propose a Bayesian inference method to constrain the intrinsic scatter of the mass proxy in stacked analyses. The scatter of the stacked data is rescaled with respect to the individual scatter based on the number of binned clusters. We apply this method to the galaxy clusters detected with the AMICO (Adaptive Matched Identifier of Clustered Objects) algorithm in the third data release of the Kilo-Degree Survey. The results confirm the optical richness as a low scatter mass proxy. Based on the optical richness and the calibrated weak lensing mass-richness relation, mass of individual objects down to ~10^13 solar masses can be estimated with a precision of ~20 per cent.
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