A MUSE view of the massive merging galaxy cluster ACT-CL J0102-4915 (El Gordo) at z = 0.87: robust strong lensing model and data release

Abstract

We present a detailed strong lensing analysis of the massive and distant ($z=0.870$) galaxy cluster ACT-CL J0102$-$4915 (ACT0102, also known as El Gordo), taking advantage of new spectroscopic data from the Multi Unit Spectroscopic Explorer (MUSE) on the Very Large Telescope, and archival imaging from the Hubble Space Telescope. Thanks to the MUSE data, we measure secure redshifts for 374 single objects, including 23 multiply lensed galaxies, and 167 cluster members of ACT0102. The observed positions of 56 multiple images, along with their new spectroscopic redshift measurements, are used as constraints for our strong lensing model. Remarkably, some multiple images are detected out to a large projected distance of $\approx 1$ Mpc from the brightest cluster galaxy, allowing us to estimate a projected total mass value of $1.84_{-0.04}^{+0.03}\times 10^{15}{\mathrm{M}}_{\odot }$ within that radius. We find that we need two extended cluster mass components, the mass contributions from the cluster members and the additional lensing effect of a foreground ($z=0.633$) group of galaxies, to predict the positions of all multiple images with a root mean square offset of $0.75"$. The main cluster-scale mass component is centered very closely to the brightest cluster galaxy and the other extended mass component is located in the north-west region of the cluster. These two mass components have very similar values of mass projected within 300 kpc from their centers, namely $2.29_{-0.10}^{+0.09}\times 10^{14}{\mathrm{M}}_{\odot }$ and $2.10_{-0.09}^{+0.08}\times 10^{14}{\mathrm{M}}_{\odot }$, in agreement with the major merging scenario of ACT0102. We make publicly available the lens model, including the magnification maps and posterior distributions of the model parameter values, as well as the full spectroscopic catalogue containing all redshift measurements obtained with MUSE.

12 pages, 9 figures, 4 tables + appendix. Minor changes, A&A in press. MUSE redshift catalogue and lens model are publicly available

References in corpus (35)

• Array Programming with NumPy
• scikit-image: Image processing in Python
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• zCOSMOS: A Large VLT/VIMOS redshift survey covering 0 < z < 3 in the COSMOS field
• A Bayesian approach to strong lensing modelling of galaxy clusters
• The Data Processing Pipeline for the MUSE Instrument
• Strong and weak lensing united III: Measuring the mass distribution of the merging galaxy cluster 1E0657-56
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Cluster Abundances and Weak Lensing
• Cluster Lenses
• Multi-scale cluster lens mass mapping I. Strong Lensing modelling
• The Halos of Satellite Galaxies: the Companion of the Massive Elliptical Lens SL2S J08544-0121
• CLASH-VLT: Insights on the mass substructures in the Frontier Fields Cluster MACS J0416.1-2403 through accurate strong lens modeling
• The MUSE Hubble Ultra Deep Field Survey: II. Spectroscopic redshifts and comparisons to color selections of high-redshift galaxies
• An excess of small-scale gravitational lenses observed in galaxy clusters
• The Atacama Cosmology Telescope: Physical Properties and Purity of a Galaxy Cluster Sample Selected via the Sunyaev-Zel'dovich Effect
• The systematics of strong lens modeling quantified: the effects of constraint selection and redshift information on magnification, mass, and multiple image predictability
• A massive blow for $\Lambda$CDM $-$ the high redshift, mass, and collision velocity of the interacting galaxy cluster El Gordo contradicts concordance cosmology
• A $\mathcal{M}\gtrsim 3$ shock in `El Gordo' cluster and the origin of the radio relic
• Mass distribution in the core of MACS J1206: robust modeling from an exceptionally large sample of central multiple images
• New high-precision strong lensing modeling of Abell 2744. Preparing for JWST observations
• A new high-precision strong lensing model of the galaxy cluster MACS J0416.1-2403
• CLASH-VLT: Abell~S1063. Cluster assembly history and spectroscopic catalogue
• Shapes and alignments of dark matter haloes and their brightest cluster galaxies in 39 strong lensing clusters
• On the average density profile of dark-matter halos in the inner regions of massive early-type galaxies
• The probability of galaxy-galaxy strong lensing events in hydrodynamical simulations of galaxy clusters
• First JWST observations of a gravitational lens: Mass model from new multiple images with near-infrared observations of SMACS J0723.3-7327
• ALMA Lensing Cluster Survey: an ALMA galaxy signposting a MUSE galaxy group at z=4.3 behind 'El Gordo'
• Head-to-Toe Measurement of El Gordo: Improved Analysis of the Galaxy Cluster ACT-CL J0102-4915 with New Wide-field Hubble Space Telescope Imaging Data
• ALMA-SZ Detection of a Galaxy Cluster Merger Shock at Half the Age of the Universe
• VLT/MUSE observations of SDSS J1029+2623: towards a high-precision strong lensing model
• Dark Matter in Galaxy Clusters: a Parametric Strong Lensing Approach
• Fossil group origins. XI. The dependence of galaxy orbits on the magnitude gap
• Improving parametric mass modelling of lensing clusters through a perturbative approach
• Strong Lensing Model of SPT-CLJ0356-5337, a Major Merger Candidate at Redshift 1.0359
• Core Mass Estimates in Strong Lensing Galaxy Clusters Using a Single-Halo Lens Model

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• The Three Hundred Project hydrodynamical simulations: Hydrodynamical weak-lensing cluster mass biases and richnesses using different hydro models
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