Brightest Cluster Galaxies and Intracluster Light: Their Mass Distribution in the Innermost Regions of Groups and Clusters

We improve the model presented in Contini & Gu that describes radial mass distribution of brightest cluster galaxies (BCGs) and diffuse component also known as intracluster light (ICL), by assuming global BCG+ICL follows sum three profiles: Jaffe exponential profiles for bulge disk BCG, respectively, a modified version an NFW profile ICL. take advantage wide sample systems simulated with our state-of-the-art semianalytic to (a) investigate reliability looking at several scaling relations between stellar within different apertures total BCG+ICL/halo mass, redshifts; (b) make prediction distance where transitions from BCG ICL dominated. find nicely reproduces all observed investigated present time compelling degree precision, but slightly biased low respect observations higher redshifts (z ? 0.5). The transition radius predicted is good agreement recent observational results, spans range ?15 kpc ?100 kpc. It mostly depends on morphology whether it or dominated, amount and/or disk, dynamical state group/cluster.