Publication : t01/073

Abstract:
The correlation between source galaxies and lensing potentials causes systematic effect on measurements of cosmic shear statistics, the so-called source clustering (SC) effect. The SC effect on the skewness of lensing convergence, $S_3$, is examined using a nonlinear semi-analytic approach and is checked against numerical simulations. The semi-analytic calculations have been performed in a wide variety of generic models for the redshift distribution of source galaxies and power-law models for the bias parameter between galaxy and dark matter distribution. A very good agreement is found between semi-analytic predictions and numerical simulations. We find the relative amplitude of SC effect on $S_3$ to be of the order of $5-40\%$. It depends significantly on the redshift distribution of sources and on the way the bias parameter evolves. We discuss possible measurement strategies to that would minimize the SC effects.