A New Method for PSF correction using the Ellipticity of Re-smeared Artificial Images in Weak Gravitational Lensing Shear Analysis
arXiv:1403.7309 · doi:10.1088/0004-637X/792/2/104
Abstract
We propose a new method for Point Spread Function (PSF) correction in weak gravitational lensing shear analysis using an artificial image with the same ellipticity as the lensed image. This avoids the systematic error associated with the approximation in PSF correction used in previous approaches. We test the new method with simulated objects which have Gaussian or Cersic profiles smeared by a Gaussian PSF, and confirm that there is no systematic error.
References in corpus (26)
- Weak Gravitational Lensing
- A Method for Weak Lensing Observations
- Detection of Weak Gravitational Lensing by Large-scale Structure
- Shapes and Shears, Stars and Smears: Optimal Measurements for Weak Lensing
- The Shear TEsting Programme 1: Weak lensing analysis of simulated ground-based observations
- Probing the Universe with Weak Lensing
- The Shear TEsting Programme 2: Factors affecting high precision weak lensing analyses
- Shear calibration biases in weak lensing surveys
- Shapelets: I. A Method for Image Analysis
- First cosmic shear results from the Canada-France-Hawaii Telescope Wide Synoptic Legacy Survey
- Bayesian Galaxy Shape Measurement for Weak Lensing Surveys -I. Methodology and a Fast Fitting Algorithm
- Image Analysis for Cosmology: Results from the GREAT10 Galaxy Challenge
- Results of the GREAT08 Challenge: An image analysis competition for cosmological lensing
- Joint Cosmic Shear Measurements with the Keck and William Herschel Telescopes
- Bayesian Galaxy Shape Measurement for Weak Lensing Surveys -II. Application to Simulations
- Dealing with systematics in cosmic shear studies: new results from the VIRMOS-Descart Survey
- Cosmic shear statistics in the Suprime-Cam 2.1 sq deg field: Constraints on Omega_m and sigma_8
- Cosmic Shear and Power Spectrum Normalization with the Hubble Space Telescope
- Shears from shapelets
- An Enlarged Cosmic Shear Survey with the William Herschel Telescope
- Weak gravitational lensing with DEIMOS
- Measuring the Cosmic Shear in Fourier Space
- Elliptical Weighted HOLICs for Weak Lensing Shear Measurement part2:PSF correction and application to Abell 370
- Elliptical Weighted HOLICs for Weak Lensing Shear Measurement. part1:Definitions and isotropic PSF correction
- Cosmic Gravitational Shear from the HST Medium Deep Survey
- Elliptical Weighted HOLICs for Weak Lensing Shear Measurement part3:Random Count Noise Effect for Image's Moments in Weak Lensing Analysis
Cited by in corpus (4)
- Analytical Noise Bias Correction for Weak Lensing Shear Analysis with ERA
- The systematic error test for PSF correction in weak gravitational lensing shear measurement by The ERA Method by Idealizing PSF
- 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