Weak lensing reconstruction through cosmic magnification I: a minimal variance map reconstruction
Weak lensing reconstruction through cosmic magnification I: a minimal variance map reconstruction
复制标题
DOI：
10.1111/j.1365-2966.2011.18956.x
复制
发表时间：
2011-05
影响因子：
4.8
通讯作者：
Xinjuan Yang;Pengjie Zhang
中科院分区：
文献类型：
--
作者：
Xinjuan Yang;Pengjie Zhang
提出了利用星系数密度分布中的宇宙放大效应重建弱透镜图的概念。我们提出了一个最小方差线性估计，以尽量减少在地图重建的主要系统和统计误差。它利用明显不同的流量依赖性分离宇宙放大信号的压倒性的星系固有的集群噪声。它还最大限度地减少散粒噪声误差的最佳加权方案的星系数密度在每个通量箱。我们的方法是在原则上适用于所有的星系调查合理的红移信息。我们证明了它的适用性对计划平方公里阵列调查，在简化的条件下。通过我们的方法重建的弱透镜图是互补的，从宇宙剪切和宇宙微波背景（CMB）和21厘米透镜。它们对弱透镜重建中的系统误差的交叉检验和改进宇宙学约束是有用的。
We present a concept study on weak lensing map reconstruction through the cosmic magnification effect in galaxy number density distribution. We propose a minimal variance linear estimator to minimize both the dominant systematic and statistical errors in the map reconstruction. It utilizes the distinctively different flux dependences to separate the cosmic magnification signal from the overwhelming galaxy intrinsic clustering noise. It also minimizes the shot noise error by an optimal weighting scheme on the galaxy number density in each flux bin. Our method is in principle applicable to all galaxy surveys with reasonable redshift information. We demonstrate its applicability against the planned Square Kilometer Array survey, under simplified conditions. Weak lensing maps reconstructed through our method are complementary to that from cosmic shear and cosmic microwave background (CMB) and 21-cm lensing. They are useful for cross-checking over systematic errors in weak lensing reconstruction and for improving cosmological constraints.