Cosmological Simulations for Combined-Probe Analyses: Covariance and
  Neighbour-Exclusion Bias
  We present a public suite of weak lensing mock data, extending the Scinet
Light Cone Simulations (SLICS) to simulate cross-correlation analyses with
different cosmological probes. These mocks include KiDS-450- and LSST-like
lensing data, cosmic microwave background lensing maps and simulated
spectroscopic surveys that emulate the GAMA, BOSS and 2dFLenS galaxy surveys.
With 844 independent realisations, our mocks are optimised for combined-probe
covariance estimation, which we illustrate for the case of a joint measurement
involving cosmic shear, galaxy-galaxy lensing and galaxy clustering from
KiDS-450 and BOSS data. With their high spatial resolution, the SLICS are also
optimal for predicting the signal for novel lensing estimators, for the
validation of analysis pipelines, and for testing a range of systematic effects
such as the impact of neighbour-exclusion bias on the measured tomographic
cosmic shear signal. For surveys like KiDS and DES, where the rejection of
neighbouring galaxies occurs within ~2 arcseconds, we show that the measured
cosmic shear signal will be biased low, but by less than a percent on the
angular scales that are typically used in cosmic shear analyses. The amplitude
of the neighbour-exclusion bias doubles in deeper, LSST-like data. The
simulation products described in this paper are made available at
http://slics.roe.ac.uk/.
