论文标题
comalit- vi。堆叠关系中的内在散射。 kids-dr3中的弱镜头amico星系簇
CoMaLit -- VI. Intrinsic scatter in stacked relations. The weak lensing AMICO galaxy clusters in KiDS-DR3
论文作者
论文摘要
星系簇的无偏和精确的质量校准对于完全利用星系簇作为宇宙探针至关重要。弱透镜信号的堆叠使我们能够测量可观察到的质量关系，直至较少的巨大的光晕光晕，而不会推断。我们提出了一种贝叶斯推理方法，以限制堆叠分析中质量代理的固有散射。基于集合簇的数量，相对于个体散射重新堆叠数据的散射。我们将此方法应用于Amico（自适应匹配的群集对象的标识符）算法在Kilo-Degree调查的第三个数据发布中检测到的星系簇。结果证实了光学丰富度为低散射质量代理。基于光学丰富度和校准的弱透镜质量关系，可以以〜20％的精度估算到〜10^13太阳能的单个物体质量。
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.
