Large scale systematic signals in weak lensing surveys

Abstract

We use numerical simulations to model the effect of seeing and extinction modulations on weak lensing surveys. We find that systematic fluctuations in the shear amplitude and source depth can give rise to changes in the $E$-mode signal and to varying amplitudes of large scale $B$-modes. Exquisite control of such systematics will be required as we approach the era of precision cosmology with weak lensing.

4 pages, 3 figures, submitted to ApJ Letters

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• Effect of Photometric Redshift Uncertainties on Weak Lensing Tomography
• Detection of large scale intrinsic ellipticity-density correlation from the Sloan Digital Sky Survey and implications for weak lensing surveys
• First cosmic shear results from the Canada-France-Hawaii Telescope Wide Synoptic Legacy Survey
• The Third Gravitational Lensing Accuracy Testing (GREAT3) Challenge Handbook
• KiDS-1000 Methodology: Modelling and inference for joint weak gravitational lensing and spectroscopic galaxy clustering analysis
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• H0LiCOW VIII. A weak lensing measurement of the external convergence in the field of the lensed quasar HE0435$-$1223
• Mapping dark matter with cosmic magnification
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• Precision measurement of cosmic magnification from 21 cm emitting galaxies
• The impact of high spatial frequency atmospheric distortions on weak lensing measurements
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• Inhomogeneous systematic signals in cosmic shear observations
• Spurious Shear from the Atmosphere in Ground-Based Weak Lensing Observations
• The effects of varying depth in cosmic shear surveys
• The power spectrum of systematics in cosmic shear tomography and the bias on cosmological parameters
• LeMoMaF: Lensed Mock Map Facility
• Cosmic Shear E/B-mode Estimation with Binned Correlation Function Data
• Pure-mode correlation functions for cosmic shear and application to KiDS-1000