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We present an updated strong-lensing analysis of the massive cluster Abell370 (A370), continuing the work first presented in Lagattuta et al. (2017). Inthis new analysis, we take advantage of the deeper imaging data from the HubbleSpace Telescope (HST) Frontier Fields program, as well as a large spectroscopicmosaic obtained with the Multi-Unit Spectroscopic Explorer (MUSE). Thanks tothe extended coverage of this mosaic, we probe the full 3D distribution ofgalaxies in the field, giving us a unique picture of the extended structure ofthe cluster and its surroundings. Our final catalog contains 584 redshifts,representing the largest spectroscopic catalog of A370 to date. Constructingthe model, we measure a total mass distribution that is quantitatively similarto our previous work -- though to ensure a low rms error in the model fit, weinvoke a significantly large external shear term. Using the redshift catalog,we search for other bound groups of galaxies, which may give rise to a morephysical interpretation of this shear. We identify three structures in narrowredshift ranges along the line of sight, highlighting possible infallingsubstructures into the main cluster halo. We also discover additionalsubstructure candidates in low-resolution imaging at larger projected radii.More spectroscopic coverage of these regions (pushing close to the A370 virialradius) and more extended, high-resolution imaging will be required toinvestigate this possibility, further advancing the analysis of theseinteresting developments.

Probing 3D Structure with a Large MUSE Mosaic: Extending the Mass Model of Frontier Field Abell 370