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We present a new strong lensing analysis of the galaxy cluster MACSJ1206.2-0847 (MACS 1206), at z=0.44, using deep spectroscopy from CLASH-VLT andVLT/MUSE archival data in combination with imaging from the Cluster Lensing andSupernova survey with Hubble. MUSE observations enable the spectroscopicidentification of 23 new multiply imaged sources, extending the previouscompilations by a factor of approximately five. In total, we use the positionalmeasurements of 82 spectroscopic multiple images belonging to 27 families atz=1.0-6.1 to reconstruct the projected total mass distribution of MACS 1206.Remarkably, 11 multiple images are found within 50 kpc of the brightest clustergalaxy, making this an unprecedented set of constraints for the innermostprojected mass distribution of a galaxy cluster. We thus find that, althoughdynamically relaxed, the smooth matter component (dark matter plus hot gas) ofMACS 1206 shows a significant asymmetry, which closely follows the asymmetricdistribution of the stellar component (galaxy members and intracluster light).We determine the value of the innermost logarithmic slope of the projectedtotal mass density profile and find it to be close to the canonicalNavarro-Frenk-White value. We demonstrate that this quantity is very robustagainst different parametrizations of the diffuse mass component; however, thisis not the case when only one central image is used in the mass reconstruction.We also show that the mass density profile from our new strong lensing model isin very good agreement with dynamical and X-ray measurements at larger radii,where they overlap.

Mass distribution in the core of MACS J1206: robust modeling from an exceptionally large sample of central multiple images