1712.09736
Removing the impact of correlated PSF uncertainties in weak lensing
Lu, Zhang, et al
Accurate reconstruction of the spatial distributions of the PSF is crucial for high precision cosmic shear measurements. Nevertheless, current methods are not good at recovering the PSF fluctuations of high spatial frequencies. In general, the residual PSF fluctuations are spatially correlated, therefore can significantly contaminate the correlation functions of the WL signals. Propose a method to correct for this contamination statistically, without any assumptions on the PSF and galaxy morphologies or their spatial distribution. Demonstrate the idea with the data from the W2 field of CFHTLenS.
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