The MICE Grand Challenge Lightcone Simulation III: Galaxy lensing mocks
  from all-sky lensing maps
  In paper I of this series (Fosalba et al. 2013), we presented a new N-body
lightcone simulation from the MICE collaboration, the MICE Grand Challenge
(MICE-GC), containing about 70 billion dark-matter particles in a (3 Gpc)^3
comoving volume, from which we built halo and galaxy catalogues using a Halo
Occupation Distribution and Halo Abundance Matching technique, as presented in
the companion Paper II (Crocce et al. 2013). Given its large volume and fine
mass resolution, the MICE-GC simulation also allows an accurate modeling of the
lensing observables from upcoming wide and deep galaxy surveys. In the last
paper of this series (Paper III), we describe the construction of all-sky
lensing maps, following the "Onion Universe" approach (Fosalba et al. 2008),
and discuss their properties in the lightcone up to z=1.4 with sub-arcmin
spatial resolution. By comparing the convergence power spectrum in the MICE-GC
to lower mass-resolution (i.e., particle mass ~ 10^11 Msun) simulations, we
find that resolution effects are at the 5 % level for multipoles l ~ 10^3 and
20 % for l ~ 10^4. Resolution effects have a much lower impact on our
simulation, as shown by comparing the MICE-GC to recent numerical fits by
Takahashi et al 2012. We use the all-sky lensing maps to model galaxy lensing
properties, such as the convergence, shear, and lensed magnitudes and
positions, and validate them thoroughly using galaxy shear auto and
cross-correlations in harmonic and configuration space. Our results show that
the galaxy lensing mocks here presented can be used to accurately model lensing
observables down to arcminute scales.
