0 Assigned ID: 1727 ----- Attempting Submission 1 (Thu Apr 08 21:58:02 GMT 2021) ----- HST Phase I Proposal 1727 successfully submitted. Receipt: # 1727-1 ----- Attempting Submission 2 (Fri Apr 09 22:01:16 GMT 2021) ----- HST Phase I Proposal 1727 successfully submitted. Receipt: # 1727-2 ----- Attempting Submission 3 (Fri Apr 09 22:23:40 GMT 2021) ----- In this Archival Legacy program we propose to fully reprocess all ACS/WFC, WFC3/UVIS and WFC3/IR imaging data in the largest HST cosmology survey fields (GOODS, ECDF-S/GEMS, full COSMOS, UDS, AEGIS/EGS, HUDF/XDF and CANDELS/3D-HST) to provide a lasting value-added dataset for the community, combining over 10,000 orbits of prime and parallel imaging exposure time on these fields, in 33 filters. Many improvements in instrument calibration and processing have become available over the 19 years over which these data were obtained, with the potential to yield significant new science. We will use the latest calibrations and innovative techniques to: (1) Create uniformly processed mosaics with significantly improved depth for all filters that have been used to observe these fields with these instruments. (2) Improve astrometry to milliarcsecond-level accuracy, tying to Gaia-DR2 and removing current ~0.2" zonal distortions, thereby providing critical information for JWST programs that rely on this level of accuracy, as well as improved PSF alignment enabling new time-domain science. (3) Apply a wealth of other instrumental improvements, including new CTE corrections, dark current subtraction, persistence corrections, and cosmic ray rejection improvements, all carried out unformly for this full ~10,000 orbit dataset. We will also use these mosaics to generate a wealth of associated products, including catalogs, shapes, and related parameters, extending beyond those that are currently available to produce a legacy dataset of lasting value for current and future work in these unique fields. The work for this project will be distributed among team members who have well-established expertise in all the areas necessary for this project, as follows: * Mosaics and image reprocessing (Koekemoer, Grogin, Rafelski, Prichard, Sunnquist, Brammer, Cooray, Windhorst, Cohen, Montes, Borlaff): - Aligned mosaics (full-depth, and single-epoch) on all fields, reprocessing all HST imaging data obtained with ACS/WFC, WFC3/UVIS, and WFC3/IR. - Updated standard calibration on all exposures, including CTE correction for ACS, also correction for persistence in WFC3/IR, and self-calibrated maps and fluctuation analysis to correct for background sky variations and other low-level features. - Applying new background correction algorithms on all the WFC3/UVIS data - Improved treatment of WFC3/IR time-variable background. * Absolute and relative astrometry (Dickinson, Koekemoer, Kartaltepe, Kocevski, Lucas): Absolute astrometry using Gaia and Pan-STARRS1, to align the HST images across the wide-field mosaics. Relative astrometry to milliarcsec precision with new Astrodrizzle/Tweakreg, with combined full-depth and single-epoch mosaics. * Multiwaveband catalalogs (Mobasher, Hemmati, Pacifici, Iyer, Kassin, Guo, Santini, Rosario, Papovich, Almaini. Liu): collect multi-wavelength datasets, T-PHOT PSF-matched catalogs (Fontana, Castellano, Grazian, Amorin), and physical parameter measurements (Santini, Nayyeri, Stefanon, Hathi) including photo-z's, masses, star formation rates and other physical parameters. * PSF construction (McGrath, Hamilton): Construction of PSFs using Starfit (Hamilton+2002) and related techniques (McGrath+2012). This would include library PSFs and TinyTim, producing PSFs from the full ACS and WFC3 dataset, and made available in a range of positions across all the mosaics and individual exposures. * User interfaces (Momcheva, Barro, Perez-Gonzalez): Extending the current Rainbow and 3D-HST interfaces to enable these new data products to be presented to the community using a coherent and consistent approach. Galaxies 0 true true false false false false false SUPPORTED