用于弱透镜剪切测量的椭圆加权HOLIC part2：PSF校正和在Abell 370上的应用
Elliptical Weighted HOLICs for Weak Lensing Shear Measurement part2:PSF correction and application to Abell 370
摘要：
我们在前一篇论文中发展了一种新的方法（E-HOLICs），通过采用椭圆权函数测量背景星系图像来估计引力切变。继上一篇论文中计算各向同性点扩散函数（PSF）校正，我们考虑在本文中的各向异性PSF校正，以适用于实际数据的E-HOLIC。作为一个例子，E-HOLICs被应用到斯巴鲁数据的大规模和紧凑的星系团A370，并能够检测到双峰在集群的中心区域与强透镜的分析一致。利用STEP II仿真研究了E-HOLIC的系统误差。特别地，我们考虑了背景星系的信噪比“S/N”的依赖关系。虽然E-HOLIC确实改善了由于第1部分中所示的椭圆率依赖性引起的系统误差，但是由于S/N依赖性引起的系统误差仍然存在，即当使用具有低S/N对象的背景星系时，E-HOLIC低估了剪切。我们讨论了一个可能的改善的S/N依赖。
英文摘要：
We have developed a new method(E-HOLICs) of estimating gravitational shear by adopting an elliptical weight function to measure background galaxy images in our previous paper. Following to the previous paper where isotropic Point Spread Function(PSF) correction is calculated, we consider an anisotropic PSF correction in this paper in order to apply E-HOLICs for real data. A an example, E-HOLICs is applied to Subaru data of massive and compact galaxy clusters A370, and is able to detect double peaks in the central region of the cluster consistent with the analysis of strong lensing. We also study the systematic error in E-HOLICs using STEP II simulation. In particular we consider the dependences of signal to noise ratio "S/N" of background galaxies in the shear estimation. Although E-HOLICs does improve systematic error due to the ellipticity dependence as shown in part 1, a systematic error due to the S/N dependence remains, namely E-HOLICs underestimates shear when background galaxies with low S/N objects are used. We discuss a possible improvement of the S/N dependence.
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