An accurate strong lensing model of the Abell 2163 core

Abstract

Abell 2163 at $z\simeq 0.201$ is one of the most massive galaxy clusters known, very likely in a post-merging phase. Data from several observational windows suggest a complex mass structure with interacting subsystems, which makes the reconstruction of a realistic merging scenario very difficult. A missing key element in this sense is unveiling the cluster mass distribution at high resolution. We perform such a reconstruction of the cluster inner total mass through a strong lensing model based on new spectroscopic redshift measurements. We use data from the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope (VLT) to confirm 12 multiple images of 4 sources with redshift values from 1.16 to 2.72. We also discover four new multiple images and identify 29 cluster members and 35 foreground and background sources. The resulting galaxy member and image catalogs are used to build five cluster total mass models. The fiducial model consists of 111 small-scale subhalos plus a diffuse component, which is centered $\sim 2$ arcseconds away from the BCG belonging to the east Abell 2163 subcluster. We confirm that the latter is well represented by a single, large-scale mass component. Its strong elongation towards a second (west) subcluster confirms the existence of a preferential axis, corresponding to the merging direction. From the fiducial model, we extrapolate the cumulative projected total mass profile and measure a value of $M(<300$kpc$)=1.43_{-0.06}^{+0.07}\times 10^{14}$M${}_{\odot }$, which has a significantly reduced statistical error compared with previous estimates, thanks to the inclusion of the spectroscopic redshifts. Our strong lensing results are very accurate: the model-predicted positions of the multiple images are, on average, only $0.15$ arcseconds away from the observed ones.

arXiv commentMinor changes in v2. Accepted for publication in A&A; 13 pages, 11 figures

References in corpus (39)

• Observational evidence for self-interacting cold dark matter
• Direct constraints on the dark matter self-interaction cross-section from the merging galaxy cluster 1E0657-56
• Cluster Lensing And Supernova survey with Hubble (CLASH): An Overview
• A Bayesian approach to strong lensing modelling of galaxy clusters
• The Frontier Fields: Survey Design
• The non-gravitational interactions of dark matter in colliding galaxy clusters
• Hubble Space Telescope Observations of the Lensing Cluster Abell 2218
• The Frontier Fields Lens Modeling Comparison Project
• RELICS: Reionization Lensing Cluster Survey
• Cosmological Constraints from Strong Gravitational Lensing in Galaxy Clusters
• Chandra Temperature Maps for Galaxy Clusters with Radio Halos
• CLASH-VLT: Insights on the mass substructures in the Frontier Fields Cluster MACS J0416.1-2403 through accurate strong lens modeling
• Extreme deconvolution: Inferring complete distribution functions from noisy, heterogeneous and incomplete observations
• CLASH-VLT: A Highly Precise Strong Lensing Model of the Galaxy Cluster RXC J2248.7-4431 (Abell S1063) and Prospects for Cosmography
• The giant radio halo in Abell 2163
• Merger shocks in galaxy clusters A665 and A2163 and their relation to radio halos
• A refined mass distribution of the cluster MACS J0416.1$-$2403 from a new large set of spectroscopic multiply lensed sources
• CLASH-VLT: Dissecting the Frontier Fields Galaxy Cluster MACS J0416.1-2403 with $\sim 800$ Spectra of Member Galaxies
• EZ: A Tool for Automatic Redshift Measurement
• The story of supernova 'Refsdal' told by MUSE
• The Reionization Lensing Cluster Survey (RELICS) and the Brightest High-z Galaxies
• ABELL 2163: Temperature, Mass, and Hydrostatic Equilibrium
• Mass distribution in the core of MACS J1206: robust modeling from an exceptionally large sample of central multiple images
• Where is the matter in the Merging Cluster Abell 2218?
• RELICS: Strong Lens Models for Five Galaxy Clusters From the Reionization Lensing Cluster Survey
• A Candidate $z\sim 10$ Galaxy Strongly Lensed into a Spatially Resolved Arc
• Multi-frequency imaging of the galaxy cluster Abell 2163 using the Sunyaev-Zel'dovich Effect
• A2163: Merger events in the hottest Abell galaxy cluster I. Dynamical analysis from optical data
• Deep Luminosity Functions and Colour-Magnitude Relations for Cluster Galaxies at 0.2 < z < 0.6
• Galaxy cluster strong lensing: image deflections from density fluctuations along the line of sight
• The effects of ellipticity and substructure on estimates of cluster density profiles based on lensing and kinematics
• MACS J0416.1-2403: Impact of line-of-sight structures on strong gravitational lensing modelling of galaxy clusters
• A2163: Merger events in the hottest Abell galaxy cluster II. Subcluster accretion with galaxy-gas separation
• Mass profile decomposition of the Frontier Fields cluster MACS J0416-02403. Insights on the Dark-Matter inner profile
• Joining X-ray to lensing: an accurate combined analysis of MACS J0416.1$-$2403
• CLASH: Extending galaxy strong lensing to small physical scales with distant sources highly-magnified by galaxy cluster members
• Dark matter distribution in the merging cluster Abell 2163
• Investigating the hard X-ray emission from the hottest Abell cluster A2163 with Suzaku
• Dark matter fraction of low-mass cluster members probed by galaxy-scale strong lensing

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• Galaxy cluster cores as seen with VLT/MUSE: new strong-lensing analyses of RX J2129.4+0009, MS 0451.6-0305 & MACSJ2129.4-0741