0 Assigned ID: 747 ----- Attempting Submission 1 (Fri Apr 10 20:08:05 GMT 2015) ----- HST Phase I Proposal 747 (phase1-AR.dwarfs.apt) successfully submitted. Receipt: # 747-1 ----- Attempting Submission 2 (Fri Apr 10 20:13:18 GMT 2015) ----- HST Phase I Proposal 747 (phase1-AR.dwarfs.apt) successfully submitted. Receipt: # 747-2 ----- Attempting Submission 3 (Fri Apr 10 20:23:33 GMT 2015) ----- HST Phase I Proposal 747 (phase1-AR.dwarfs.apt) successfully submitted. Receipt: # 747-3 ----- Attempting Submission 4 (Fri Apr 10 20:23:50 GMT 2015) ----- Thousands of HST orbits have been dedicated to obtaining resolved images of individual stars in local galaxies, in order to create color-magnitude diagrams that can discern their star formation histories. Most of these galaxies are dwarfs, thought to be the primary drivers of reionization, and ideal testbeds for understanding the nature of dark matter and the impact of energetic feedback on star formation. Meanwhile, simulators have recently achieved success in reproducing these dwarf galaxies for the first time. We propose here to expand a successful model for dwarf galaxies to the largest simulation sample ever run, simulating ~100 dwarfs with stellar masses < 10^9 Msun. We will achieve this by running large zoomed-in regions that contain many dwarfs. These regions will sample a range of under- and over-denities with respect to the cosmic mean, and thus the dwarfs will span a range of stellar and halo masses, and merger and accretion histories. Importantly, we will mimic the observations, creating mock color-magnitude diagrams so that distinguishing features related to evolution can be identified. With this sample, we will tie star formation histories to kinematics, dark matter structure, and gas fractions. We will make predictions for age and metallicity gradients. Finally, we will generate mock images of the dwarfs near the epoch of reionization, testing the escape fraction of ionizing radiation and duty cycle, and making predictions for detectability with JWST. RESOLVED STELLAR POPULATIONS 0 Regular false false false false true SUPPORTED