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tokens: We wish to acknowledge the anonymous referee whose questions and comments improved the content and quality of the manuscript. This research was supported by National Science Foundation (NSF) grants AST-1109243 and AST-1615848 to M.L.N. J.H.W. acknowledges support from NSF grant AST-1333360 and Hubble Theory grants HST-AR-13895 and HST-AR-14326. The simulations were performed using the ENZO code on the Comet system at the San Diego Supercomputer Center, University of California, San Diego, with support from XRAC allocation MCA-TG98020N to M.L.N. This research has made use of NASA’s Astrophysics Data System Bibliographic Services. The majority of the analysis and plots were done with yt (Turk et al. 2011 ). ENZO and yt are developed by a large number of independent researchers from numerous institutions around the world. Their commitment to open science has helped make this work possible.