English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a pilot study of the intracluster light (ICL) in massive clustersusing imaging of the $z=0.566$ cluster of galaxies WHL J013719.8-08284 observedby the RELICS project with the HST. We measure the ICL fraction in four opticalACS/WFC filters (F435W, F475W, F606W, and F814W) and five infrared WFC3/IRbands (F105W, F110W, F125W, F140W, and F160W). The ICL maps are calculatedusing the free of a priori assumptions algorithm CICLE, and the clustermembership is estimated from photometric properties. We find optical ICLfractions that range between $\sim$6\% and 19\% in nice agreement with thevalues found in previous works for merging clusters. We also observe an ICLfraction excess between 3800 \AA and 4800 \AA, previously identified as asignature of merging clusters at $0.18<z<0.55$. This excess suggests thepresence of an enhanced population of young/low-metallicity stars in the ICL.All indicators thus point to WHL J013719.8-08284 as a disturbed cluster with asignificant amount of recently injected stars, bluer than the average starshosted by the cluster members and likely stripped out from infalling galaxiesduring the current merging event. Infrared ICL fractions are $\sim$50\% higherthan the optical ones, which could be signature of an older and/orhigher-metallicity ICL population that can be associated with the build-up ofthe BCG, the passive evolution of young stars, previously injected, orpreprocessing in infalling groups. Finally, investigating the photometry of thecluster members, we tentatively conclude that WHL J013719.8-08284 fulfills theexpected conditions for a fossil system progenitor.

RELICS: ICL Analysis of the $z=0.566$ merging cluster WHL J013719.8-08284