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Multiwavelength deep observations are a key tool to understand the origin ofthe diffuse light in clusters of galaxies: the intra-cluster light (ICL). Forthis reason, we take advantage of the Hubble Frontier Fields survey toinvestigate the properties of the stellar populations of the ICL of its 6massive intermediate redshift (0.3<z<0.6) clusters. We carry on this analysisdown to a radial distance of ~120 kpc from the brightest cluster galaxy. Wefound that the average metallicity of the ICL is [Fe/H] ~-0.5, compatible withthe value of the outskirts of the Milky Way. The mean stellar ages of the ICLare between 2 to 6 Gyr younger than the most massive galaxies of the clusters.Those results suggest that the ICL of these massive (> 10^15 Msol) clusters isformed by the stripping of MW-like objects that have been accreted at z<1, inagreement with current simulations. We do not find any significant increase inthe fraction of light of the ICL with cosmic time, although the redshift rangeexplored is narrow to derive any strong conclusion. When exploring the slope ofthe stellar mass density profile, we found that the ICL of the HFF clustersfollows the shape of their underlying dark matter haloes, in agreement with theidea that the ICL is the result of the stripping of galaxies at recent times.

Intracluster Light at the Frontier II: The Frontier Fields Clusters