A fast semi-analytical covariance for the galaxy-PSF tau-statistics is derived and validated against simulations and jackknife on UNIONS data, including a redefined tau-statistic that breaks the alpha-eta degeneracy.
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Galaxy-Point Spread Function correlations as a probe of weak-lensing systematics with UNIONS data
A fast semi-analytical covariance for the galaxy-PSF tau-statistics is derived and validated against simulations and jackknife on UNIONS data, including a redefined tau-statistic that breaks the alpha-eta degeneracy.