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We present an analysis of the intracluster light in the Frontier FieldCluster MACS J1149.5+2223 (z=0.544), which combines new and archival HubbleWFC3/IR imaging to provide continuous radial coverage out to 2.8 Mpc from thebrightest cluster galaxy. Employing careful treatment of potential systematicbiases and using data at the largest radii to determine the background skylevel, we reconstruct the surface brightness profile out to a radius of 2 Mpc.This radius is the largest to which the intracluster light (ICL) has beenmeasured for an individual cluster. Within this radius, we measure a totalluminosity of 1.5e13 Lsun for the brightest cluster galaxy plus ICL light. Fromthe profile and its logarithmic slope, we identify the transition from thebrightest cluster galaxy to ICL at r~70 kpc. Remarkably, we also detect aninflection in the profile centered in the 1.2-1.7 Mpc (0.37-0.52 r200m) radialbin, a signature of an infall caustic in the stellar distribution. Based uponthe shape and strength of the feature, we interpret it as potentially being atthe splashback radius, although the radius is smaller than theoreticalpredictions. If this is the splashback radius, then it is the first suchdetection in the ICL and the first detection of the splashback radius for anindividual cluster. Similar analyses should be possible with the other FrontierField clusters, and eventually with clusters from the Euclid and Romanmissions.

Discovery of a Possible Splashback Feature in the Intracluster Light of MACS J1149.5+2223