Joint analysis of Dark Energy Survey Year 3 data and CMB lensing from SPT and Planck . II. Cross-correlation measurements and cosmological constraints
Joint analysis of Dark Energy Survey Year 3 data and CMB lensing from SPT and Planck . II. Cross-correlation measurements and cosmological constraints
复制标题
对暗能量调查第 3 年数据以及 SPT 和普朗克的 CMB 透镜的联合分析。
DOI：
10.1103/physrevd.107.023530
复制
发表时间：
2023
影响因子：
5
通讯作者：
Andrade-Oliveira, F.
中科院分区：
文献类型：
--
作者：
Chang, C.;Omori, Y.;Baxter, E. J.;Doux, C.;Choi, A.;Pandey, S.;Alarcon, A.;Alves, O.;Amon, A.;Andrade-Oliveira, F.
星系位置和星系剪切与宇宙微波背景（CMB）引力透镜图的互相关对宇宙中大尺度结构的分布很敏感。这种互相关性预计也不会受到一些系统效应的影响，这些系统效应使星系巡天内部的相关测量变得复杂。我们展示了暗能量巡天前三年数据中星系位置和星系透镜之间互相关性的测量和建模，以及结合了使用南极望远镜进行的 SPT-SZ 巡天数据和普朗克卫星全天数据得出的 CMB 透镜图。本分析中使用的 CMB 透镜图的构建方式可以最大限度地减少热 Sunyaev Zel'dovich 效应带来的偏差，使它们非常适合互相关研究。当使用针对线性（非线性）星系偏差模型优化的角度尺度选择时，互相关测量的总信噪比为 23.9 (25.7)。我们使用互相关测量来获得对宇宙学参数的约束。对于我们的基准星系样本，它由四个星等选择的星系组成，当我们在建模中假设线性（非线性）星系偏差时，我们发现了 and（和）的约束。仅考虑星系剪切力与 CMB 透镜的互相关性，我们发现 和 。我们的限制与最近的宇宙剪切测量一致，但低于普朗克主要 CMB 测量的首选值。
Cross-correlations of galaxy positions and galaxy shears with maps of gravitational lensing of the cosmic microwave background (CMB) are sensitive to the distribution of large-scale structure in the Universe. Such cross-correlations are also expected to be immune to some of the systematic effects that complicate correlation measurements internal to galaxy surveys. We present measurements and modeling of the cross-correlations between galaxy positions and galaxy lensing measured in the first three years of data from the Dark Energy Survey with CMB lensing maps derived from a combination of data from theSPT-SZ survey conducted with the South Pole Telescope and full-sky data from thePlancksatellite. The CMB lensing maps used in this analysis have been constructed in a way that minimizes biases from the thermal Sunyaev Zel’dovich effect, making them well suited for cross-correlation studies. The total signal-to-noise of the cross-correlation measurements is 23.9 (25.7) when using a choice of angular scales optimized for a linear (nonlinear) galaxy bias model. We use the cross-correlation measurements to obtain constraints on cosmological parameters. For our fiducial galaxy sample, which consist of four bins of magnitude-selected galaxies, we find constraints ofand(and) when assuming linear (nonlinear) galaxy bias in our modeling. Considering only the cross-correlation of galaxy shear with CMB lensing, we findand. Our constraints onare consistent with recent cosmic shear measurements, but lower than the values preferred by primary CMB measurements fromPlanck.