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We derive a free-form mass distribution for the massive cluster AS1063(z=0.348) using the completed optical imaging from the Hubble Frontier Fieldsprogramme. Based on a subset of 11 multiply lensed systems with spectroscopicredshift we produce a lens model that is accurate enough to unveil new multiplylensed systems, totalling over a 100 arclets, and to estimate their redshiftsgeometrically. Consistency is found between this precise model and thatobtained using only the subset of lensed sources with spectroscopicallymeasured redshifts. Although a relatively large elongation of the massdistribution is apparent relative to the X-ray map, no significant offset isfound between the centroid of our mass distribution and that of the X-rayemission map, suggesting a relatively relaxed state for this cluster. For thewell resolved lensed images we provide detailed model comparisons to illustratethe precision of our model and hence the reliability of our de-lensed sources.A clear linear structure is associated with one such source extending approx.23 kpc in length, that could be an example of jet-induced star formation, atredshift z=3.1.

A Free-Form mass model of the Hubble Frontier Fields Cluster AS1063 (RXC J2248.7-4431) with over one hundred constraints