论文标题
SPT和Planck II的DES 3年数据和CMB镜头的联合分析：互相关测量和宇宙学约束
Joint analysis of DES Year 3 data and CMB lensing from SPT and Planck II: Cross-correlation measurements and cosmological constraints
论文作者
论文摘要
银河位置和星系剪切的互相关，并带有宇宙微波背景（CMB）的重力镜头图（CMB）的近图对宇宙中大规模结构的分布敏感。预计此类互相关也可以免疫一些系统的系统效应，这些效应使相关测量值复杂化。我们介绍了在黑暗能源调查的数据的前三年测量的星系位置和星系镜头之间的互相关的测量和建模，该数据与CMB透镜图相结合，这些图从2500 deg $^2 $ spt-Sz调查的数据组合得出，该数据与South Poles望远镜和Planck Satellite的South Pole望远镜一起进行。该分析中使用的CMB镜头图的构建方式是最大程度地减少Sunyaev Zel'Dovich效应的偏差，使其非常适合互相关研究。当使用针对线性（非线性）星系偏置模型优化的角度尺度的选择时，互相关测量的总信号到噪声为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。对于我们的基础星系样品，由四个大小选择的星系组成，我们发现$ω_{m} = 0.272^{+0.272^{+0.032} _ { - 0.052} $和$ S_ 0.736^{+0.032} _ { - 0.028} $（$ω__{m} = 0.245^{+0.026} _ { - 0.044} $和$ s_ {8} = 0.734^= 0.734^{+0.035} _ {+0.035} _ {+0.035} _ { - 0.028} $）建模。考虑仅考虑Galaxy剪切与CMB镜头的互相关，我们发现$ω_{M} = 0.270^{+0.043} _ { - 0.061} $和$ S_ {8} = 0.740^{+0.740^{+0.034} _ {+0.034} _ { - 0.029} $。我们对$ S_8 $的限制与最近的宇宙剪切测量相一致，但低于普朗克主要CMB测量值的值。
Cross-correlations of galaxy positions and galaxy shears with maps of gravitational lensing of the cosmic microwave background (CMB) are sensitive to the distribution of large-scale structure in the Universe. Such cross-correlations are also expected to be immune to some of the systematic effects that complicate correlation measurements internal to galaxy surveys. We present measurements and modeling of the cross-correlations between galaxy positions and galaxy lensing measured in the first three years of data from the Dark Energy Survey with CMB lensing maps derived from a combination of data from the 2500 deg$^2$ SPT-SZ survey conducted with the South Pole Telescope and full-sky data from the Planck satellite. 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 of $Ω_{m} = 0.272^{+0.032}_{-0.052}$ and $S_{8} \equiv σ_8 \sqrt{Ω_{m}/0.3}= 0.736^{+0.032}_{-0.028}$ ($Ω_{m} = 0.245^{+0.026}_{-0.044}$ and $S_{8} = 0.734^{+0.035}_{-0.028}$) when assuming linear (nonlinear) galaxy bias in our modeling. Considering only the cross-correlation of galaxy shear with CMB lensing, we find $Ω_{m} = 0.270^{+0.043}_{-0.061}$ and $S_{8} = 0.740^{+0.034}_{-0.029}$. Our constraints on $S_8$ are consistent with recent cosmic shear measurements, but lower than the values preferred by primary CMB measurements from Planck.
