0 Assigned ID: 1727 ----- Attempting Submission 1 (Fri Mar 01 20:15:33 GMT 2013) ----- HST Phase I Proposal 1727 (HSTcycle21_phase1_submission_ALR.pdf.apt) successfully submitted. ----- Attempting Submission 2 (Fri Mar 01 20:19:52 GMT 2013) ----- Very early in its operation, the Hubble Space Telescope (HST) opened an entirely new frontier: study of the demographics and properties of star clusters far beyond the Milky Way. However, interpretation of HST's observations has proven difficult, and has led to the development of two conflicting models. One view is that most massive star clusters are disrupted during their infancy by feedback from newly formed stars (i.e., "infant mortality"), independent of cluster mass or environment. The other model is that most star clusters survive their infancy and are disrupted later by mass-dependent dynamical processes. Since observations at present have failed to discriminate between these views, we propose a theoretical investigation to provide new insight. We will perform radiation-hydrodynamic simulations of the formation of massive star clusters, including for the first time a realistic treatment of the most important stellar feedback processes. These simulations will elucidate the physics of stellar feedback, and allow us to determine whether cluster disruption is mass-dependent or -independent. We will also use our simulations to search for observational diagnostics that can distinguish bound from unbound clusters, and to predict how cluster disruption affects the cluster luminosity function in a variety of galactic environments. UNRESOLVED STELLAR POPULATIONS AND GALAXY STRUCTURE Default Medium false false false false true SUPPORTED