论文标题
黑暗能源调查3年结果：聚类红移 - 用Redmagic和Boss/Eboss的弱透镜源红移分布的校准
Dark Energy Survey Year 3 Results: Clustering Redshifts -- Calibration of the Weak Lensing Source Redshift Distributions with redMaGiC and BOSS/eBOSS
论文作者
论文摘要
我们介绍了黑暗能源调查3年（des Y3）弱透镜源银河红移分布$ n（z）$从聚类测量中进行的校准。特别是，我们与红色的星系（具有安全的光度红移的发光红色星系）和来自boss/eBoss的光谱样品的红色星系（可发光的红色星系）交叉互相互相介绍，以估计DES源样品的红移分布。描述了使用聚类统计量的两种不同的方法。第一个使用聚类信息独立使用聚类信息来估计红移窗口内源星系的平均红移，如DES Y1分析所做的那样。第二种方法将聚类数据作为$ n（z）$的函数建立了可能性，可以将其合并到方案中，以生成$ n（z）$的样品，约有组合聚类和光度法约束。两种方法都融合了各种天体物理系统的边缘化，包括放大倍率和红移依赖的星系偏置。我们表征了模拟中方法的不确定性；第一种方法将层析成像箱的平均$ z $恢复到$ \ sim 0.014 $的RMS（精度）。显示第二种方法的使用大大提高了从光度数据中得出的$ n（z）$的形状的准确性。然后将这两种方法应用于DES Y3数据。
We present the calibration of the Dark Energy Survey Year 3 (DES Y3) weak lensing source galaxy redshift distributions $n(z)$ from clustering measurements. In particular, we cross-correlate the weak lensing (WL) source galaxies sample with redMaGiC galaxies (luminous red galaxies with secure photometric redshifts) and a spectroscopic sample from BOSS/eBOSS to estimate the redshift distribution of the DES sources sample. Two distinct methods for using the clustering statistics are described. The first uses the clustering information independently to estimate the mean redshift of the source galaxies within a redshift window, as done in the DES Y1 analysis. The second method establishes a likelihood of the clustering data as a function of $n(z)$, which can be incorporated into schemes for generating samples of $n(z)$ subject to combined clustering and photometric constraints. Both methods incorporate marginalisation over various astrophysical systematics, including magnification and redshift-dependent galaxy-matter bias. We characterise the uncertainties of the methods in simulations; the first method recovers the mean $z$ of tomographic bins to RMS (precision) of $\sim 0.014$. Use of the second method is shown to vastly improve the accuracy of the shape of $n(z)$ derived from photometric data. The two methods are then applied to the DES Y3 data.
