Designing weak lensing surveys: a generalized eigenmode analysis
Designing weak lensing surveys: a generalized eigenmode analysis
复制标题
设计弱透镜调查：广义本征模分析
DOI：
--
复制
发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Cavendish Lab. Cambridge
中科院分区：
文献类型：
--
作者：
M. Kilbinger;Dipak Munshi Universitaet Bonn;I. Cambridge;Cavendish Lab. Cambridge
研究了各种二阶弱透镜统计量的估计，如剪切相关函数和孔径质量色散（M2 ap），它们可以直接由弱透镜剪切映射构造.我们比较这些估计可以用来约束宇宙学参数的效率。为此，我们介绍了弱透镜调查的Karhunen-Loeve（KL）本征模分析技术。这些工具被证明是非常有效的诊断优化调查策略。这些工具的有用性，以研究角面元的效果，深度和宽度的调查和噪声的贡献，由于内在的椭圆度和源星系的数量密度上的宇宙学参数的估计被证明。从独立分析的各种参数和联合估计的结果进行了比较。我们还研究了各种宇宙学和调查参数之间的简并如何影响与这些参数相关的本征模。
We study the estimators of various second-order weak lensing statistics such as the shear correlation functions ξ± and the aperture mass dispersion (M 2 ap ) which can directly be constructed from weak lensing shear maps. We compare the efficiency with which these estimators can be used to constrain cosmological parameters. To this end we introduce the Karhunen-Loeve (KL) eigenmode analysis techniques for weak lensing surveys. These tools are shown to be very effective as a diagnostics for optimizing survey strategies. The usefulness of these tools to study the effect of angular binning, the depth and width of the survey and noise contributions due to intrinsic ellipticities and number density of source galaxies on the estimation of cosmological parameters is demonstrated. Results from independent analysis of various parameters and joint estimations are compared. We also study how degeneracies among various cosmological and survey parameters affect the eigenmodes associated with these parameters.