KiDS+VIKING-450: An internal-consistency test for cosmic shear
  tomography with a colour-based split of source galaxies
  We performed an internal-consistency test of the KiDS+VIKING-450 (KV450)
cosmic shear analysis with a colour-based split of source galaxies. Utilising
the same measurements and calibrations for both sub-samples, we inspected the
characteristics of the shear measurements and the performance of the
calibration pipelines. On the modelling side, we examined the observational
nuisance parameters, specifically those for the redshift calibration and
intrinsic alignments, using a Bayesian analysis with dedicated test parameters.
We verified that the current nuisance parameters are sufficient for the KV450
data to capture residual systematics, with slight deviations seen in the second
and the third redshift tomographic bins. Our test also showcases the degeneracy
between the inferred amplitude of intrinsic alignments and the redshift
uncertainties in low redshift tomographic bins. The test is rather insensitive
to the background cosmology and, therefore, can be implemented before any
cosmological inference is made.
