updated title 716922547 Your proposal could not be saved. Submission aborted. Assigned ID: 4580 ----- Attempting Submission 1 (Wed May 24 20:12:00 GMT 2023) ----- HST Phase I Proposal 4580 successfully submitted. Receipt: # 4580-1 ----- Attempting Submission 2 (Wed May 24 20:15:56 GMT 2023) ----- HST Phase I Proposal 4580 successfully submitted. Receipt: # 4580-2 ----- Attempting Submission 3 (Wed May 24 22:56:50 GMT 2023) ----- HST Phase I Proposal 4580 successfully submitted. Receipt: # 4580-3 ----- Attempting Submission 4 (Wed May 24 22:59:49 GMT 2023) ----- We propose a comprehensive (re-)analysis of the complete canon of Archival grism observations obtained with ACS/WFC (G800L) and WFC3/IR (G102 and G141) having multiple position angles. We will show that by employing modernized extraction algorithms and calibration methods/data (e.g. time-variable sky background estimates) the signal-to-noise and spectral resolution of the grism data (that have multiple position angles) can be improved by factors of up to 50%, but possibly exceeding this for select fields and source geometries. After a careful survey of the MAST Archive, we have identified 249 fields with multiple position angles, which are composed of ~8100 independent exposures constituting ~6.8 megaseconds (~2500 orbits) of HST time. The significant improvements in signal-to-noise and spectral resolution come simply from improved extraction techniques, but the homogeneous reprocessing of this enormous dataset have an invaluable legacy value to the Archive. Although every science topic that make use of grism observations will be enhanced by our reprocessing, we have identified several classes of astrophysical sources where the improvements will have an immediate impact: low-luminosity AGN, extreme-emission line galaxies, high-redshift galaxies, dusty galaxies at intermediate redshifts, and single/multi AGN. As with all Archival Legacy programs, we will deliver our data products (one-dimensional spectra, direct-image mosaics, and source catalogs) to MAST and publish/document our software/pipeline on GitHub, Zenodo, and refereed journals (as appropriate) on a timely basis. PI Ryan is an expert in the analysis of wide-field slitless spectroscopy (WFSS) and primary developer and architect of the pyLINEAR codebase, methodology, and publications. PI Ryan has reduced/extracted WFSS for dozens of scientific publications, led analysis of brown dwarfs and low-mass stars, and examined various technical aspects of WFC3/IR and WFSS in general. PI Ryan has led several large projects and working groups, primarily for the Nancy Grace Roman Space Telescope. coI Carleton is an expert in the analysis of HST imaging on the Amazon Web Services (AWS), as the led author and chief organizer of the SKYSURF program (a comprehensive examination of ALL of the WFC3 and ACS broadband imaging to measure the sky surface brightness as a function of position, date, and wavelength). coI Carter is an expert in AWS data processing and familiar with many aspects of the WFSS data analysis. coI Carter will support the team in working with AWS. coI Cohen is an expert in observing and working with HST imaging. coI Cohen will serve the team as an overall program manager and organizer. coI Cohen is an expert on the interplay between AGN and their host galaxies. coI Grogin is the ACS team lead, and will support the team in technical matters related ACS and HST in general. coI Grogin is an expert in AGN physics, in particular time-varying phenomena. coI Hathi is an expert in galaxy evolution, having led and contributed to numerous papers cross-cutting high-redshift galaxies, disk/bulge growth, and deep-field astronomy. coI Hathi is an expert in WFSS observations by serving as the HSTaXe lead, with multiple calibration programs, and data-analysis publications. coI Nair is an expert in galaxy evolution, in particular the role of quenching and cosmic downsizing. coI Nair will support the team in all matters related to understanding low-mass galaxy and AGN spectroscopy. coI Petric is an expert on infrared astronomy and detectors, having been an integral member in the Mauna Kea Spectroscopic Explorer and central to the calibration of the detectors for the Nancy Grace Roman Space Telescope. coI Petric is an expert in AGN physics and contribute to this project in understanding the complex relationship between the supermassive black holes and host galaxies. coI Pirzkal is a foremost expert in WFSS having led multiple approved scientific and calibration programs, central developer of aXe, and pioneered triangulation techniques in WFSS data. coI Pirzkal is an expert in extreme-emission line galaxies and star-formation in general. coI Rothberg is an expert in galaxy evolution and the ISM, in particular the physical effects in ionized regions of galaxies. coI Rothberg has experience working with WFSS data and WFC3/IR, and will support the team in general aspects. coI Rutkowski is an expert in restframe UV spectroscopy of galaxy, having written papers on dust emission from the 2175 A bump, UV-upturn from evolved stars, and quenching processes. coI Rutkowski will contribute this knowledge to the understanding of galaxy spectroscopy at intermediate redshifts. coI Windhorst is an expert on HST observing and space-based astronomy. coI Windhorst is one of the interdisciplinary JWST scientists and PI of the SKYSURF program (mentioned above). coI Windhorst is interested in cosmic reionization, and will lend expertise in high-redshift galaxy properties. Galaxies Supermassive Black Holes and Active Galaxies 0 Legacy false false false false false false SUPPORTED