The Galaxy Replacement Technique (GRT): a New Approach to Study Tidal
  Stripping and Formation of Intracluster Light in a Cosmological Context
  We introduce the Galaxy Replacement Technique (GRT) that allows us to model
tidal stripping of galaxies with very high-mass
(m$_{\rm{star}}=5.4\times10^4$~M$_\odot$/h) and high-spatial resolution (10
pc/h), in a fully cosmological context, using an efficient and fast technique.
The technique works by replacing multiple low-resolution DM halos in the base
cosmological simulation with high-resolution models, including a DM halo and
stellar disk. We apply the method to follow the hierarchical build-up of a
cluster since redshift $\sim8$ to now, through the hierarchical accretion of
galaxies, individually or in substructures such as galaxy groups. We find we
can successfully reproduce the observed total stellar masses of observed
clusters since redshift $\sim$1. The high resolution allows us to accurately
resolve the tidal stripping process and well describe the formation of
ultra-low surface brightness features in the cluster ($\mu_{V}<32$ mag
arcsec$^{-2}$) such as the intracluster light (ICL), shells and tidal streams.
We measure the evolution of the fraction of light in the ICL and brightest
cluster galaxy (BCG) using several different methods. While their broad
response to the cluster mass growth history is similar, the methods show
systematic differences, meaning we must be careful when comparing studies that
use distinct methods. The GRT represents a powerful new tool for studying tidal
effects on galaxies and exploring the formation channels of the ICL in a fully
cosmological context and with large samples of simulated groups and clusters.
