0 Assigned ID: 2208 ----- Attempting Submission 1 (Fri Apr 09 20:27:46 GMT 2021) ----- HST Phase I Proposal 2208 successfully submitted. Receipt: # 2208-1 ----- Attempting Submission 2 (Fri Apr 09 21:19:15 GMT 2021) ----- HST Phase I Proposal 2208 successfully submitted. Receipt: # 2208-2 ----- Attempting Submission 3 (Fri Apr 09 21:47:37 GMT 2021) ----- HST Phase I Proposal 2208 successfully submitted. Receipt: # 2208-3 ----- Attempting Submission 4 (Fri Apr 09 21:49:24 GMT 2021) ----- We propose a comprehensive archival survey of attenuation-insensitive Paschen-beta star formation rates and histories, resolved line maps, and dust attenuation estimates from existing 3D-HST G141 observations of ~400 low-redshift galaxies. This large sample is made possible only by the unique combination of near-IR sensitivity and high multiplexing of the HST G141 grism. The 3D-HST survey provides the ideal dataset, augmented by CANDELS multiwavelength photometry that is among the deepest in the sky, plus public catalogs of ground-based optical spectra and H-alpha line fluxes. However, this proposal represents an entirely different experiment than the science cases of the initial 3D-HST proposal. Our study is also an effective low-redshift pathfinder for JWST Paschen-line observations of high-redshift galaxy samples observed in the near future. The PI and Co-I's have extensive experience designing, reducing, analyzing, and publishing HST G102 and G141 grism observations. As part of the CLEAR, 3D-HST, and CANDELS teams, the PI and Co-I's have published over 100 refereed papers using HST grism data. The graduate student PI will perform the bulk of the data reduction and science publications, supervised by the admin PI and other Co-I's. Galaxies 0 Regular false false false false false SUPPORTED