0 Assigned ID: 3125 ----- Attempting Submission 1 (Fri Mar 25 03:44:32 GMT 2022) ----- HST Phase I Proposal 3125 successfully submitted. Receipt: # 3125-1 ----- Attempting Submission 2 (Fri Mar 25 19:52:27 GMT 2022) ----- HST Phase I Proposal 3125 successfully submitted. Receipt: # 3125-2 ----- Attempting Submission 3 (Fri Mar 25 20:10:08 GMT 2022) ----- HST Phase I Proposal 3125 successfully submitted. Receipt: # 3125-3 ----- Attempting Submission 4 (Fri Mar 25 22:57:26 GMT 2022) ----- HST Phase I Proposal 3125 successfully submitted. Receipt: # 3125-4 ----- Attempting Submission 5 (Fri Mar 25 23:02:41 GMT 2022) ----- Despite their advantageous position above the atmosphere, HST ACS and WFC3 detectors are sensitive to a large number of sources of light contamination. Photons that reach the detector out of their intended optical paths (stray-light) generate artificial systematic gradients, increasing the background level, and ultimately limiting of detection of astronomical sources. Standard background correction techniques (i.e., fit & subtract) have proven to be an inefficient solution only suitable for the study of bright, compact sources, while they significantly lead to over-subtraction of the dim, extended emission from galactic halos, intergalactic dust cirrus, tidal tails and the diffuse intracluster light. As a consequence, a significant fraction of HST scientific potential remains undiscovered in the original raw exposures. The proposed project (STRAYCOR) will be focused on the modelling and correction, on a pixel-per-pixel basis, of the stray-light background for ACS and WFC3/IR images. We will generate stray-light models based on the relative position and flux from every source visible from HST including 1) Zodiacal light, the Milky Way interstellar medium, and Extragalactic Background, 2) the emission from stars and Solar System bodies, and 3) extended reflected light from Earth and the Moon. This forward modelling approach will allow correcting artificial gradients, improving the low surface brightness detection capabilities of the Hubble Space Telescope. The proposed methodology will complement and be implemented in two ongoing Hubble Archive Legacy proposals dedicated to the recalibration of HST archival data (SUPERCAL and SKY-SURF). Dr. Alejandro S. Borlaff (PI), is responsible for all tasks related to software development of the point and extended source catalogues, the estimation of stray-light in the simulated images and the rendering of the panoramic environment simulations. He is currently a postdoc a NASA Ames Research Center and an expert in image analysis and photometry methods. His experience in the use of state-of-the-art algorithms to recover low surface brightness emission from optical and near-infrared data (HST, Euclid) are critical to the success of this project. Dr. Pamela M Marcum, (co-I), provides overall management and leads tasks related to the retrieval of point-source photometry (Gaia, 2MASS). She is currently a research scientist at NASA Ames Research Center and an expert in image analysis and photometry methods. As a former Program Scientist (Kepler, WISE) and Project Scientist (SOFIA), she has considerable experience in science management. Her experience in the study of extended extragalactic sources in astronomical images is strongly relevant to the goals of the proposed project. Dr. Mireia Montes, (collaborator), is currently an STScI Prize Fellow at the Space Telescope Science Institute, and has extensive experience with the use and reduction of HST observations. She is an expert on galaxy evolution, stellar halos, ultra-diffuse galaxies, low surface brightness science. Her expertise is critical to identify the potential effects of the proposed pipeline on high-level scientific products and to provide accurate predictions for the efficiency of HST on ultra-low brightness regimes. Mr. Alejandro Camazon-Pinilla, (collaborator), is PhD student at the University of Florida. He is an expert in the analysis of end-to-end cosmological simulations and space telescope observational methods. As part of his PhD project, he will assist with the stray-light analysis estimations, including the use of the Normalized Detector Irradiance to estimate the stray-light flux per pixel created by the visible sources from HST. Mr. Mario Fernandez Palos, (collaborator), is an aerospace engineer and space science consultant. He is an expert in 3D rendering of space observations, and has extensive experience with realistic astronomical simulations of complex solar system bodies, including asteroids (ESA/Hera, ESA/Comet Interceptor). He will assist with the tasks related to the 3D rendering of the simulations, providing the paroramic view images that will be used to estimate the stray-light emission from visible objects. He will collaborate in the estimation of the BRDF and albedo of the Earth, as well as the implementation of astronomical and background sources into the simulation. Dr. Anton Koekemoer, (collaborator), will assist with the identification of systematic effects and image reduction analysis on ultra-deep exposures, including its application in SUPERCAL (HST Proposal. Cycle 29, ID. #16621, Koekemoer et al. 2021). He is a research scientist at the Space Telescope Science Institute who was the team instrument lead for HST/NICMOS, and has considerable experience creating science-level imaging mosaic databases such as for the CDFS, GOODS, UDF, and CANDELS. Prof. Rogier A. Windhorst, (collaborator), is a professor at the School Of Earth and Space Exploration of Arizona State University. He is an expert in astronomy, cosmology, galaxy formation and evolution, and astronomical instrumentation. He is one of the world's six Interdisciplinary Scientists for NASA's 6.5 meter James Webb Space Telescope (JWST), and the PI of the SKY-SURF Hubble Legacy Project (HST Proposal. Cycle 27, ID. #15810), dedicated to the recalibration of Hubble Archival observations using models of the Extragalactic Background Light and the Zodiacal Light. His expertise with HST will be fundamental for the proposed project, and he will assist in the implementation of STRAYCOR with SKY-SURF products. Dr. Lee Spitler, (collaborator), is a professor at the Macquarie University in Sydney, Australia. He is an expert in low surface brightness astronomy, galaxy evolution and structure, as well as space-based astronomical instrumentation. He will assist in the implementation of the Zodiacal light, Extragalactic light, and Interstellar medium emission in the background models, and the implementation of the stray-light correction models in SKY-SURF. Sarah Elizabeth Caddy, (collaborator), is a PhD candidate at Macquarie University. She is an expert in the detection of dim extended light from low Earth Orbit with the Hubble Space Telescope and the future Australian SkyHopper Space Telescope. She will assist with the implementation of the SKY-SURF Zodiacal and Extragalactic light background models into the STRAYCOR pipeline, as well as the validation of the results. Dr. Fernando Buitrago, (collaborator), is a Distinguished Senior Researcher at the University of Valladolid (Spain). He is an expert on galaxy formation and evolution, including the study of the outer regions of galaxies (stellar halos). He will assist with the identification of archival HST observations that could have been affected by sky over-subtraction. Dr. Javier Roman, (collaborator), is a Margarita Salas Fellow at the Kapteyn Astronomical Institute (Groningen, the Netherlands). He is an expert on galaxy evolution and data calibration for ultra-low surface brightness observations. His expertise will be key for the validation of the stray-light models in the individual HST exposures. Dr. Rafael Guzman, (collaborator), is a Professor of the Department of Astronomy at the University of Florida. His field of experience is galaxy evolution and space instrumentation. As PhD director of Alejandro Camazon-Pinilla, he will participate in the simulation of stray-light from extended sources. Dr. Michael Fanelli, (collaborator), is a researcher at NASA Ames Research Center. He has extensive experience in stellar population analysis using multi-wavelength datasets and in image processing and data interpretation. He will provide scientific advice and assistance for the interpretation of the reprocessed HST mosaics. 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