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Abell 2163 at $z \simeq 0.201$ is one of the most massive galaxy clustersknown, very likely in a post-merging phase. Data from several observationalwindows suggest a complex mass structure with interacting subsystems, whichmakes the reconstruction of a realistic merging scenario very difficult. Amissing key element in this sense is unveiling the cluster mass distribution athigh resolution. We perform such a reconstruction of the cluster inner totalmass through a strong lensing model based on new spectroscopic redshiftmeasurements. We use data from the Multi Unit Spectroscopic Explorer (MUSE) onthe Very Large Telescope (VLT) to confirm 12 multiple images of 4 sources withredshift values from 1.16 to 2.72. We also discover four new multiple imagesand identify 29 cluster members and 35 foreground and background sources. Theresulting galaxy member and image catalogs are used to build five cluster totalmass models. The fiducial model consists of 111 small-scale subhalos plus adiffuse component, which is centered $\sim2$ arcseconds away from the BCGbelonging to the east Abell 2163 subcluster. We confirm that the latter is wellrepresented by a single, large-scale mass component. Its strong elongationtowards a second (west) subcluster confirms the existence of a preferentialaxis, corresponding to the merging direction. From the fiducial model, weextrapolate the cumulative projected total mass profile and measure a value of$M(<300\,$kpc$) = 1.43^{+0.07}_{-0.06}\times 10^{14}\,$M$_{\odot}$, which has asignificantly reduced statistical error compared with previous estimates,thanks to the inclusion of the spectroscopic redshifts. Our strong lensingresults are very accurate: the model-predicted positions of the multiple imagesare, on average, only $0.15$ arcseconds away from the observed ones.

An accurate strong lensing model of the Abell 2163 core