.png){kind=icon}
返回
Shapelets - II. A method for weak lensing measurements
.png){kind=icon}
PRE
AI
DOI：10.1046/j.1365-8711.2003.05902.x.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
Weak gravitational lensing provides a unique method to directly measure the distribution of mass in the Universe. Because the distortions induced by lensing in the shape of background galaxies are small, the measurement of weak lensing requires high precision. Here, we present a new method for obtaining reliable weak shear measurements. It is based on the shapelet function formalism presented in an earlier paper in which galaxy images are decomposed into several shape components, each providing independent estimates of the local shear. The formalism affords an efficient modelling and deconvolution of the point spread function. Using the unique properties of shapelets under distortions, we construct a simple, minimum variance estimator for the shear. We describe how we implement the method in practice, and test the method using realistic simulated images. We find our method to be stable and reliable for conditions analogous to ground-based surveys. Compared to earlier methods, our method has the advantages of being accurate, linear, mathematically well-defined, and optimally sensitive, as it uses the full shape information available for each galaxy.
Keyword:
gravitational lensing
methods : data analysis
techniques : image processing
cosmology : observations
dark matter
large-scale structure of Universe
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
4.8
论文数:
7.1W
被引数:
25.0W
机构
暂无机构信息
.png){kind=icon}
查看更多内容