On Scale-Dependent Cosmic Shear Systematic Effects
  In this paper we investigate the impact that realistic scale-dependence
systematic effects may have on cosmic shear tomography. We model spatially
varying residual ellipticity and size variations in weak lensing measurements
and propagate these through to predicted changes in the uncertainty and bias of
cosmological parameters. We show that the survey strategy - whether it is
regular or randomised - is an important factor in determining the impact of a
systematic effect: a purely randomised survey strategy produces the smallest
biases, at the expense of larger parameter uncertainties, and a very
regularised survey strategy produces large biases, but unaffected
uncertainties. However, by removing, or modelling, the affected scales
(l-modes) in the regular cases the biases are reduced to negligible levels. We
find that the integral of the systematic power spectrum is not a good metric
for dark energy performance, and we advocate that systematic effects should be
modelled accurately in real space, where they enter the measurement process,
and their effect subsequently propagated into power spectrum contributions.
