Investigating Cluster Astrophysics and Cosmology with Cross-Correlation of the Thermal Sunyaev-Zel'dovich Effect and Weak Lensing
Investigating Cluster Astrophysics and Cosmology with Cross-Correlation of the Thermal Sunyaev-Zel'dovich Effect and Weak Lensing
复制标题
利用热 Sunyaev-Zeldovich 效应和弱透镜的互相关研究星团天体物理学和宇宙学
DOI：
10.1093/mnras/stx3215
复制
发表时间：
2017
影响因子：
4.8
通讯作者：
and Naoki Yoshida
中科院分区：
文献类型：
--
作者：
Ken Osato;Samuel Flender;Daisuke Nagai;Masato Shirasaki;and Naoki Yoshida
最近探测到的热Sunyaev-Zel'dovich（tSZ）效应和弱引力透镜（WL）的互相关，使独特的研究团天体物理学和宇宙学。本文利用Planck的tSZ功率谱、Planck的tSZ-WL互相关和红星系团序列透镜巡天的测量结果，给出了星系团非热压力分量α0和物质功率谱σ8的振幅限制。我们将数据拟合到具有协方差矩阵的半解析模型中，使用N体模拟。我们发现，单独的tSZ功率谱更倾向于σ8 <$0.85和大部分的非热压力（α0 <$0.2 -0.3）。另一方面，tSZ-WL互相关倾向于显著较低的σ8 <0.6和较低的α0 <0.05。我们表明，这种紧张局势可以减轻允许在恒星质量晕质量关系，这将导致减少低质量晕的气体的陡峭的斜率。在这样的模型中，组合数据更倾向于σ8 <$0.7和α0 <$0.2，与流体动力学模拟的预测一致。
Recent detections of the cross-correlation of the thermal Sunyaev–Zel'dovich (tSZ) effect and weak gravitational lensing (WL) enable unique studies of cluster astrophysics and cosmology. In this work, we present constraints on the amplitude of the non-thermal pressure fraction in galaxy clusters, α0, and the amplitude of the matter power spectrum, σ8, using measurements of the tSZ power spectrum fromPlanck, and the tSZ–WL cross-correlation fromPlanckand the Red Cluster Sequence Lensing Survey. We fit the data to a semi-analytic model with the covariance matrix usingN-body simulations. We find that the tSZ power spectrum alone prefers σ8∼ 0.85 and a large fraction of non-thermal pressure (α0∼ 0.2–0.3). The tSZ–WL cross-correlation on the other hand prefers a significantly lower σ8∼ 0.6 and low α0∼ 0.05. We show that this tension can be mitigated by allowing for a steep slope in the stellar mass–halo mass relation, which would cause a reduction of the gas in low-mass haloes. In such a model, the combined data prefer σ8∼ 0.7 and α0∼ 0.2, consistent with predictions from hydrodynamical simulations.