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We present a new gravitational lens model of the Hubble Frontier Fieldscluster Abell 370 ($z = 0.375$) using imaging and spectroscopy from HubbleSpace Telescope and ground-based spectroscopy. We combine constraints from acatalog of 1344 weakly lensed galaxies and 39 multiply-imaged sources comprisedof 114 multiple images, including a system of multiply-imaged candidates at$z=7.93 \pm 0.02$, to obtain a best-fit mass distribution using the clusterlens modeling code Strong and Weak Lensing United. As the only analysis of A370using strong and weak lensing constraints from Hubble Frontier Fields data, ourmethod provides an independent check on assumptions in other methods on themass distribution. Convergence, shear, and magnification maps are made publiclyavailable through the HFF website. We find that the model we produce is similarto models produced by other groups, with some exceptions due to the differencesin lensing code methodology. In an effort to study how our total projected massdistribution traces light, we measure the stellar mass density distributionusing Spitzer/Infrared Array Camera imaging. Comparing our total mass densityto our stellar mass density in a radius of 0.3 Mpc, we find a mean projectedstellar to total mass ratio of $\langle f* \rangle = 0.011 \pm 0.003$ (stat.)using the diet Salpeter initial mass function. This value is in generalagreement with independent measurements of $\langle f* \rangle$ in clusters ofsimilar total mass and redshift.

Mass and Light of Abell 370: A Strong and Weak Lensing Analysis