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

Abstract

We present a pilot study of the intracluster light (ICL) in massive clusters using imaging of the $z=0.566$ cluster of galaxies WHL J013719.8-08284 observed by the RELICS project with the HST. We measure the ICL fraction in four optical ACS/WFC filters (F435W, F475W, F606W, and F814W) and five infrared WFC3/IR bands (F105W, F110W, F125W, F140W, and F160W). The ICL maps are calculated using the free of a priori assumptions algorithm CICLE, and the cluster membership is estimated from photometric properties. We find optical ICL fractions that range between $\sim$6\% and 19\% in nice agreement with the values found in previous works for merging clusters. We also observe an ICL fraction excess between 3800 Åand 4800 Å, previously identified as a signature of merging clusters at $0.18<z<0.55$. This excess suggests the presence 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 a significant amount of recently injected stars, bluer than the average stars hosted by the cluster members and likely stripped out from infalling galaxies during the current merging event. Infrared ICL fractions are $\sim$50\% higher than the optical ones, which could be signature of an older and/or higher-metallicity ICL population that can be associated with the build-up of the BCG, the passive evolution of young stars, previously injected, or preprocessing in infalling groups. Finally, investigating the photometry of the cluster members, we tentatively conclude that WHL J013719.8-08284 fulfills the expected conditions for a fossil system progenitor.

22 pages, 8 figures, 4 tables, accepted fo publication in ApJ

References in corpus (24)

• A calibration of the relation between the abundance of close galaxy pairs and the rate of galaxy mergers
• The Burrell Schmidt Deep Virgo Survey: Tidal Debris, Galaxy Halos, and Diffuse Intracluster Light in the Virgo Cluster
• The Formation and Evolution of Intracluster Light
• Witnessing galaxy preprocessing in the local Universe: the case of a star-bursting group falling into Abell 1367
• Diffuse Optical Light in Galaxy Clusters II: Correlations with Cluster Properties
• Calibration of the optical mass proxy for clusters of galaxies and an update of the WHL12 cluster catalog
• J-PAS: The Javalambre-Physics of the Accelerated Universe Astrophysical Survey
• Separating baryons and dark matter in cluster cores: a full 2-D lensing and dynamic analysis of Abell 383 and MS2137-23
• Intracluster Light at the Frontier II: The Frontier Fields Clusters
• The miniJPAS survey: a preview of the Universe in 56 colours
• Intra-Cluster Light at the Frontier: Abell 2744
• Intragroup diffuse light in compact groups of galaxies II. HCG 15, 35 and 51
• The buildup of the intracluster light of Abell 85 as seen by Subaru's Hyper Suprime-Cam
• Photometric dissection of Intracluster Light and its correlations with host cluster properties
• The Growth of Intracluster Light in XCS-HSC Galaxy Clusters from $0.1<z<0.5$
• NoSOCS in SDSS. I. Sample Definition and Comparison of Mass Estimates
• On the dust content of galaxy clusters
• Empirical Photometric Redshifts of Luminous Red Galaxies and Clusters in SDSS
• The formation of dusty cold gas filaments from galaxy cluster simulations
• Diffuse stellar emission in X-ray luminous galaxy clusters at z~0.3 I. Is the diffuse optical light boosted and rejuvenated in merging clusters?
• Dust in clusters: separating the contribution of galaxies and intracluster media
• Measuring the total infrared light from galaxy clusters at z=0.5-1.6: connecting stellar populations to dusty star formation
• The GALEX Ultraviolet Virgo Cluster Survey (GUViCS) VIII. Diffuse dust in the Virgo intra-cluster space
• Reliable Photometric Membership (RPM) of Galaxies in Clusters. I. A Machine Learning Method and its Performance in the Local Universe

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• Physical properties of more than one thousand brightest cluster galaxies detected in the Canada France Hawaii Telescope Legacy Survey
• Deep view of the intracluster light in the Coma cluster of galaxies
• Intra-Cluster Light as a Dynamical Clock for Galaxy Clusters: Insights from the MAGNETICUM, IllustrisTNG, Hydrangea and Horizon-AGN Simulations
• The intracluster light analysis of the most evolved systems of galaxies: fossil groups
• Independent Evidence for earlier formation epochs of fossil groups of galaxies through the intracluster light: the case for RX J100742.53+380046.6