The Transition Region between Brightest Cluster Galaxies and Intracluster Light in Galaxy Groups and Clusters

We take advantage of a state-of-art semi analytic model galaxy formation, and the presented in \citet{contini21a}, to investigate mass distribution Brightest Cluster Galaxies (BCGs) Intra-Cluster Light (ICL) by addressing two points: (1) region transition between BCG dominated an ICL one, and; (2) relation total BCG+ICL one alone. find radius be independent both halo masses, with average 60$\pm$40 kpc, good agreement previous observational measurements, but given large scatter, it can considered as sort physical separation components only on cluster scale. From analysis $M_{ICL}-M_{BCG+ICL}$ relation, we build method able extract directly from knowledge one. Given scatter low systems, such under/overpredicts true value significant way, up factor three worst cases. On other hand, for $\log M_{BCG+ICL}>12$ or M_{Halo}>14$, difference extracted ranges $\pm$30\%. therefore suggest this reliable test works aiming isolate BCG, systems hosted haloes