Hubble Frontier Fields: A High-Precision Strong-Lensing Analysis of Galaxy Cluster MACSJ0416.1-2403 Using ∼200 Multiple Images

We present a high-precision mass model of the galaxy cluster MACSJ0416.1–2403, based on a strong-gravitational-lensing analysis of the recently acquired Hubble Space Telescope Frontier Fields (HFF) imaging data. Taking advantage of the unprecedented depth provided by HST/ACS observations in three passbands, we identify 51 new multiply imaged galaxies, quadrupling the previous census and bringing the grand total to 68, comprising 194 individual lensed images. Having selected a subset of the 57 most securely identified multiply imaged galaxies, we use the Lenstool software package to constrain a lens model comprised of two cluster-scale dark-matter halos and 98 galaxy-scale halos. Our best-fit model predicts image positions with an RMS error of 0.68′′, which constitutes an improvement of almost a factor of two over previous, pre-HFF models of this cluster. We find the total projected mass insid