Shear Measurement with Poorly Resolved Images

Abstract

Weak lensing studies typically require excellent seeing conditions for the purpose of maximizing the number density of well-resolved galaxy images. It is interesting to ask to what extent the seeing size limits the usefulness of the astronomical images in weak lensing. In this work, we study this issue with the data of the DECam Legacy Survey (DECaLS), which is a part of the target selection program for the Dark Energy Spectroscopic Instrument (DESI). Using the Fourier Quad shear measurement pipeline, we demonstrate that images with relatively poor seeing conditions (around 1.5 arcsec) can still yield accurate shear estimators. We do not find any correlation between systematic shear error and the image resolution.

arXiv comment13 pages, 19 figures, submitted

References in corpus (31)

• Overview of the DESI Legacy Imaging Surveys
• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• KiDS-450: Cosmological parameter constraints from tomographic weak gravitational lensing
• Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data
• Dark Energy Survey Year 3 Results: Cosmology from Cosmic Shear and Robustness to Data Calibration
• Bayesian Galaxy Shape Measurement for Weak Lensing Surveys - III. Application to the Canada-France-Hawaii Telescope Lensing Survey
• Weak Gravitational Lensing and its Cosmological Applications
• Gravitational Lensing Analysis of the Kilo Degree Survey
• A discriminating probe of gravity at cosmological scales
• Systematic errors in weak lensing: application to SDSS galaxy-galaxy weak lensing
• The first-year shear catalog of the Subaru Hyper Suprime-Cam SSP Survey
• Origins of weak lensing systematics, and requirements on future instrumentation (or knowledge of instrumentation)
• CFHTLenS: Testing the Laws of Gravity with Tomographic Weak Lensing and Redshift Space Distortions
• The brighter-fatter effect and pixel correlations in CCD sensors
• Calibration of weak-lensing shear in the Kilo-Degree Survey
• Cosmic shear results from the deep lens survey - I: Joint constraints on omega_m and sigma_8 with a two-dimensional analysis
• KiDS-1000 Methodology: Modelling and inference for joint weak gravitational lensing and spectroscopic galaxy clustering analysis
• First test of Verlinde's theory of Emergent Gravity using Weak Gravitational Lensing measurements
• Constraining $f(R)$ Gravity Theory Using Weak Lensing Peak Statistics from the Canada-France-Hawaii-Telescope Lensing Survey
• Dark Energy Survey Year 3 Results: Point-Spread Function Modeling
• Characterization and correction of charge-induced pixel shifts in DECam
• KiDS+2dFLenS+GAMA: Testing the cosmological model with the $E_{\mathrm{G}}$ statistic
• Accurate Shear Measurement with Faint Sources
• Halo ellipticity of GAMA galaxy groups from KiDS weak lensing
• Approaching the Cramer-Rao Bound in Weak Lensing with PDF Symmetrization
• Testing Shear Recovery with Field Distortion
• Testing PSF Interpolation In Weak Lensing With Real Data
• Towards a Bias-Free Selection Function in Shear Measurement
• Weak Lensing Study in VOICE Survey I: Shear Measurement
• Constraining Dark Energy With Stacked Concave Lenses
• Weak Lensing Study in VOICE Survey II: Shear Bias Calibrations

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• Satellite Content and Halo Mass of Galaxy Clusters: Comparison between Red-Sequence and Halo-based Optical Cluster Finders
• Ellipticities of Galaxy Cluster Halos from Halo-Shear-Shear Correlations