Full sky Integrated Sachs-Wolfe maps for the MICE Grand Challenge
  lightcone simulation
  We present full-sky maps of the Integrated Sachs-Wolfe effect (ISW) for the
MICE Grand Challenge lightcone simulation up to redshift 1.4. The maps are
constructed in the linear regime using spherical Bessel transforms. We compare
and contrast this procedure against analytical approximations found in the
literature. By computing the ISW in the linear regime, we remove the
substantial computing and storage resources required to calculate the
non-linear Rees-Sciama effect. Since the linear ISW at low redshift $z\leq1$,
at large angular scales, and after matter domination is $\sim 10^{2}\times$
larger in $\Delta T/T$, this has a negligible impact on the maps produced and
only becomes relevant on scales which are dominated by cosmic microwave
background (CMB) anisotropies. The MICE simulation products have been
extensively used for studies involving current and future galaxy surveys. The
availability of these maps will allow MICE to be used for future galaxy and CMB
cross-correlation studies, ISW reconstruction studies, and ISW void-stacking
studies probed by galaxy surveys such as Dark Energy Survey, Dark Energy
Spectroscopic Instrument, Euclid, and Rubin Legacy Survey of Space and Time.
The pipeline developed in this study is provided as a public Python package
pyGenISW. This could be used in the future studies for constructing the ISW
from existing and future simulation suites probing vast sets of cosmological
parameters and models.
