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We present a free form mass reconstruction of the massive lensing clusterMACSJ0416.1-2403 using the latest Hubble Frontier Fields data. Our modelindependent method finds that the extended lensing pattern is generated by twoelongated, closely projected clusters of similar mass. Our lens modelidentifies new lensed images with which we improve the accuracy of the darkmatter distribution. We find that the bimodal mass distribution is nearlycoincident with the bimodal X-ray emission, but with the two dark matter peakslying closer together than the centroids of the X-ray emisison. We show thiscan be achieved if the collision has occurred close to the plane and such thatthe cores are deflected around each other. The projected mass profiles of bothclusters are well constrained because of the many interior lensed images,leading to surprisingly flat mass profiles of both components in the region15-100 kpc. We discuss the extent to which this may be generated by tidalforces in our dynamical model which are large during an encounter of this typeas the cores "graze" each other. The relative velocity between the two cores isestimated to be about 1200 km/s and mostly along the line of sight so that ourmodel is consistent with the relative redshift difference between the two cDgalaxies (dz = 0.04).

Free Form Lensing Implications for the Collision of Dark Matter and Gas in the Frontier Fields Cluster MACSJ0416.1-2403