Delensing galaxy surveys
Delensing galaxy surveys
复制标题
德伦辛星系巡天
DOI：
10.1093/mnras/stu1104
复制
发表时间：
2014
影响因子：
4.8
通讯作者：
B. Jain
中科院分区：
文献类型：
--
作者：
Chihway L. Chang;B. Jain
微弱的引力透镜效应会造成遥远星系影像的位移、放大、旋转和剪切。大多数研究集中在剪切和放大效应，因为它们更容易观察到。在本文中，我们专注于透镜位移对宽场图像的影响。红移为0.5- 1的星系通常位移1角分，并且位移在度大小的斑块上是相干的。然而，位移效应是与红移相关的，因此在不同红移的星系之间存在可见的相对位移，即使它们在天空中很近。我们表明，重建原来的星系的位置是可行的透镜调查，覆盖数百平方度。我们测试模拟两种方法来“脱透镜”：一种使用剪切测量和其他使用前景星系分布作为代理的质量。我们还估计了前景偏转对星系透镜测量的影响，发现它只与LSST和欧几里得时代的调查有关。
Weak gravitational lensing can cause displacements, magnification, rotation and shearing of the images of distant galaxies. Most studies focus on the shear and magnification effects since they are more easily observed. In this paper we focus on the effect of lensing displacements on wide field images. Galaxies at redshifts 0.5--1 are typically displaced by 1 arcminute, and the displacements are coherent over degree-size patches. However the displacement effect is redshift-dependent, so there is a visible relative shift between galaxies at different redshifts, even if they are close on the sky. We show that the reconstruction of the original galaxy position is now feasible with lensing surveys that cover many hundreds of square degrees. We test with simulations two approaches to "delensing": one uses shear measurements and the other uses the foreground galaxy distribution as a proxy for the mass. We also estimate the effect of foreground deflections on galaxy-galaxy lensing measurements and find it is relevant only for LSST and Euclid-era surveys.
CFHTLenS：加拿大、法国、夏威夷望远镜透镜调查 成像数据和目录产品
DOI：
10.1111/j.1365-2966.2012.21952.x
发表时间：
2012
影响因子：
4.8
作者：
C. Heymans
通讯作者：
C. Heymans