On cosmological bias due to the magnification of shear and position
  samples in modern weak lensing analyses
  The magnification of galaxies in modern galaxy surveys induces additional
correlations in the cosmic shear, galaxy-galaxy lensing and clustering
observables used in modern lensing "3x2pt" analyses, due to sample selection.
In this paper, we emulate the magnification contribution to all three
observables utilising the SLICS simulations suite, and test the sensitivity of
the cosmological model, galaxy bias and redshift distribution calibration to
un-modelled magnification in a Stage-IV-like survey using Monte-Carlo sampling.
We find that magnification cannot be ignored in any single or combined
observable, with magnification inducing $>1\sigma$ biases in the $w_0-\sigma_8$
plane, including for cosmic shear and 3x2pt analyses. Significant cosmological
biases exist in the 3x2pt and cosmic shear from magnification of the shear
sample alone. We show that magnification induces significant biases in the mean
of the redshift distribution where a position sample is analysed, which may
potentially be used to identify contamination by magnification.
