Tracing the Peculiar Dark Matter Structure in the Galaxy Cluster CL 0024+17 with Intracluster Stars and Gas

Abstract

ICL is believed to originate from the stars stripped from cluster galaxies. They are no longer gravitationally bound to individual galaxies, but to the cluster, and their smooth distribution potentially makes them serve as much denser tracers of the cluster dark matter than the sparsely distributed cluster galaxies. We present our study of the ICL in Cl 0024+17 using both ACS and Subaru data, where we previously reported discovery of a ringlike dark matter structure with gravitational lensing. The ACS images provide much lower sky levels than ground data, and enable us to measure relative variation of surface brightness reliably. This analysis is repeated with the Subaru images to examine if consistent features are recovered despite different reduction scheme and instrumental characteristics. We find that the ICL profile clearly resembles the peculiar mass profile, which stops decreasing at r~50" (~265 kpc) and slowly increases until it turns over at r~75" (~397 kpc). This feature is seen in both ACS and Subaru images for nearly all available passband images while the features are stronger in red filters. The consistency across different filters and instruments strongly rules out the possibility that the feature might come from any residual, uncorrected calibration errors. In addition, our re-analysis of the cluster X-ray data shows that the peculiar mass structure is also indicated by a non-negligible bump in the intracluster gas profile when the geometric center of the dark matter ring, not the peak of the X-ray emission, is chosen as the center of the radial bin. The location of the gas ring is closer to the center by ~15" (~80 kpc), raising an interesting possibility that the ring-like structure is expanding and the gas ring is lagging behind perhaps because of the ram pressure if both features in mass and gas share the same dynamical origin.

Accepted to ApJ for publication

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Cited by in corpus (19)

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• Lost but not Forgotten: Intracluster Light in Galaxy Groups and Clusters
• Intra Cluster Light properties in the CLASH-VLT cluster MACS J1206.2-0847
• On the Origin of Intracluster Light in Massive Galaxy Clusters
• Diffuse optical intracluster light as a measure of stellar tidal stripping: the cluster CL0024+17 at $z\sim$0.4 observed at LBT
• An Investigation of intra-cluster light evolution using cosmological hydro-dynamical simulations
• Disentangling the ICL with the CHEFs: Abell 2744 as a case study
• Intracluster light is already abundant at redshift beyond unity
• Evidence for the existence of abundant intracluster light at z= 1.24
• Diffuse Intracluster Light at Intermediate Redshifts: ICL observations in a X-ray cluster at z=0.29
• Intracluster Light Properties in a Fossil Cluster at z=0.47
• A High-Caliber View of the Bullet Cluster Through JWST Strong and Weak Lensing Analyses
• Quantifying the Origin and Distribution of Intracluster Light in a Fornax-like Cluster
• RELICS: ICL Analysis of the $z=0.566$ merging cluster WHL J013719.8-08284
• Mock Observations: Formation and Evolution of diffuse light in Galaxy Groups and Clusters in the IllustrisTNG Simulations
• The velocity structure of the intracluster medium during a major merger: simulated microcalorimeter observations
• Euclid preparation LXX. Forecasting detection limits for intracluster light in the Euclid Wide Survey
• Growth of Ex-situ Diffuse Intragroup Light in Simulated Galaxy Groups
• Predicting Halo Formation Time Using Machine Learning