Elliptical Weighted HOLICs for Weak Lensing Shear Measurement part2:PSF correction and application to Abell 370
arXiv:1107.5863 · doi:10.1088/0004-637X/748/2/112
Abstract
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.
28 pages, 15 figures, submitted ApJ
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- CLASH: Mass Distribution in and around MACS J1206.2-0847 from a Full Cluster Lensing Analysis
- IM3SHAPE: A maximum-likelihood galaxy shear measurement code for cosmic gravitational lensing
- Analytical Noise Bias Correction for Weak Lensing Shear Analysis with ERA
- Elliptical Weighted HOLICs for Weak Lensing Shear Measurement part3:Random Count Noise Effect for Image's Moments in Weak Lensing Analysis
- The systematic error test for PSF correction in weak gravitational lensing shear measurement by The ERA Method by Idealizing PSF
- A New Method for PSF correction using the Ellipticity of Re-smeared Artificial Images in Weak Gravitational Lensing Shear Analysis
- A new weak lensing shear analysis method using ellipticity defined by 0th order moments
- New highly precise weak gravitational lensing flexions measurement method based on ERA method