1 research outputs found
Source-lens clustering effects on the skewness of the lensing convergence
The correlation between source galaxies and lensing potentials causes a
systematic effect on measurements of cosmic shear statistics, known as the
source-lens clustering (SLC) effect. The SLC effect on the skewness of lensing
convergence, , 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 the galaxy
and dark matter distributions. The semi-analytic predictions are tested
successfully against numerical simulations. We find the relative amplitude of
the SLC effect on to be of the order of five to forty per cent. It
depends significantly on the redshift distribution of sources and on the way
the bias parameter evolves. We discuss possible measurement strategies to
minimize the SLC effects.Comment: 14 pages, 14 figures, accepted for publication in MNRA