弱引力透镜峰值陡度统计首次应用于HSC Y1数据：有效探测暗物质晕密度轮廓
First application of weak lensing peak steepness statistics to HSC Y1 data: effectively probing halo density profiles
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中文总结 AI 辅助
研究将弱引力透镜峰值陡度统计首次应用于HSC Y1数据，结合HMcode2016框架分析得到S₈和浓度参数A，支持星系团尺度强重子反馈效应
中文摘要 AI 辅助
作为一种新型探测手段，弱引力透镜（WL）峰值陡度统计对暗物质晕的密度轮廓敏感，该轮廓蕴含重子反馈和暗物质性质的重要信息，因此是利用WL数据统计约束这些效应的有前途方法。本文介绍其首次应用于HSC Y1数据，以展示这一新统计量的巨大潜力。在HMcode2016的唯象框架内，该框架将重子反馈仅归因于暗物质晕浓度参数的降低，且聚焦于主要来自大质量星系团的高峰值，我们结合WL峰值高度和陡度统计的分析得到S₈=0.76⁺⁰·⁰⁸₋₀·⁰⁷，最大后验概率（MAP）为0.79，且晕浓度较低。采用浓度-质量关系形式c(M,z)=A(1+z_f)/(1+z)，其中z_f为红移z处质量为M的晕的形成红移，我们得到A=1.93⁺¹·³³₋₁·¹⁶（MAP=1.70），而仅暗物质模拟 mock 得到的A为3.34⁺¹·⁵²₋₁·⁷⁴（MAP=3.31）。该结果在唯象上支持星系团尺度存在强重子反馈效应。
英文摘要
As a new probe, the weak lensing (WL) peak steepness statistics is sensitive to the density profile of halos that encodes important information of baryonic feedback and dark matter properties, leading to a promising means to statistically constrain these effects using WL data. In this article, we present its first application to HSC Y1 data to demonstrate the great potential of this new statistics. Within the phenomenological framework of HMcode2016 that attributes the baryonic feedback solely to the reduction of the halo concentration parameter and focusing on high peaks originated dominantly from massive clusters, our analyses by combining WL peak height and steepness statistics resulted in $S_8=0.76^{+0.08}_{-0.07}$ with the maximum-a-posteriori (MAP) of $0.79$ and low concentrations. Taking the form of the concentration-mass relation as $c(M,z)=A(1+z_{\rm f})/(1+z)$ with $z_{\rm f}$ being the formation redshift of halos with mass $M$ at redshift $z$, we obtain $A=1.93^{+1.33}_{-1.16}$ (MAP=$1.70$) in comparison with $A=3.34^{+1.52}_{-1.74}$ (MAP=3.31) from dark matter only simulated mocks. The result tends to support phenomenologically strong baryonic feedback effects at cluster scales.
