The ZOGY image differencing matching kernel and PSF solutions and their practical implementation issues

Abstract

We present the ideal matching kernel and PSF solutions for Gaussian input PSFs in the ZOGY image matching, noise decorrelation and subtraction method. We discuss sources of numerical noise in Fourier-space calculations that can lead to spatially badly bound image artifacts in the difference images. We briefly study the connection between the Alard-Lupton PSF matching with the decorrelation afterburner and the ZOGY subtraction methods.