The growth of intracluster light in XCS-HSC galaxy clusters from 0.1 &amp;lt; <i>z</i> &amp;lt; 0.5

ABSTRACT We estimate the intracluster light (ICL) component within a sample of 18 clusters detected in XMM Cluster Survey (XCS) data using deep (?26.8 mag) Hyper Suprime-Cam Subaru Strategic Programme release 1 i-band data. apply rest-frame ?B = 25 mag arcsec?2 isophotal threshold to our clusters, below which we define as ICL an aperture RX,500 (X-ray R500) centred on brightest cluster galaxy (BCG). After applying careful masking and corrections for flux losses from background subtraction, recover ?20 per cent flux, approximately four times typical at same level (${\sim}5{{\ \rm per\ cent}}$). find that makes up about ${\sim}24{{\ cent}}$ total stellar mass average (?41 including contained BCG 50 kpc); this value is well matched with other observational studies semi-analytic/numerical simulations, but significantly smaller than results recent hydrodynamical simulations (even when measured observationally consistent way). no evidence any links between amount mass, growth rate 2–4 0.1 &amp;lt; z 0.5. conclude dominant evolutionary ? 1. Our work highlights need approach measuring alongside deeper imaging, order unambiguously measure across broad redshift range possible (e.g. 10-yr stacked imaging Vera C. Rubin Observatory).