tokens: Acknowledgments The authors thank Thomas Bisbas, Tanio Diaz-Santos, Duncan Farrah, Munan Gong, Javier Gracia-Carpio and Eve Ostriker for providing both simulation and observational data that aided us when developing these models. DN thanks Aaron Evans, Thomas Greve, Rob Kennicutt, Dominik Riechers, J. D. Smith, Gordon Stacey, Dan Stark, Karen Olsen and Mark Wolfire for helpful conversations. Partial support for DN was provided by NSF AST-1009452, AST-1445357, NASA HST AR-13906.001 from the Space Telescope Science Institute, which is operated by the Association of University for Research in Astronomy, Incorporated, under NASA Contract NAS5-26555, and a Cottrell College Science Award, awarded by the Research Corporation for Science Advancement. MRK acknowledges support from US NSF grant AST-1405962 and Australian Research Council grant DP160100695.
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