Make quantitative maps of ICL (Rudick et
al 2006).
Inferences:
Much ICL spawned in group environment, then completely
liberated as groups fall together to form clusters.
Morphology and luminosity tied to dynamical evolution
Amount of ICL grows as cluster evolves and accretes
Morphology: Initially significant substructure
(streams, plumes); later a smooth, diffuse ICL as the tidally stripped
ICL "mixes" in the cluster environment.
Phase space structure holds a dynamical memory of accretion history, accessible via intracluster PNe.