0 Assigned ID: 852 ----- Attempting Submission 1 (Fri Mar 06 22:22:28 GMT 2020) ----- Measuring weak gravitational lensing (WL), a powerful probe of the distribution of dark matter, is one of the primary science goals of the next decade of large extragalactic surveys with LSST, Euclid, SKA and WFIRST. Currently, however, the WL analysis has primarily been on optical-band data (e.g. HST/ACS, DES, and HSC-SSP). Near-infrared (NIR) imaging has thus far never been used for wide-field weak lensing measurement although it is now well-known that it provides superior galaxy shape measurements at z > 1 due to morphological k-correction. We propose an archival study to present the first galaxy shear catalog with the largest set of archival NIR images from the two widest HST/WFC3 surveys: CANDELS and COSMOS-DASH. Our program will aim to 1) test the fidelity of the resultant NIR WL map of dark matter in COSMOS with existing, optically- derived maps, 2) reveal galaxy over-densities at z > 1 in clusters/groups which are otherwise unknown due to photometric redshift uncertainties, 3) derive stellar/baryonic to dark matter mass ratios at z >1. Measuring these ratios on group and low-mass cluster scales will trace the relationship between the growth of large scale structure and the buildup of stellar mass thereby allowing a more complete understanding of galaxy evolution, and comparison with cosmological models over a relatively understudied redshift range. Due to the exceptional depth and spatial resolution of HST, and by leveraging the current state-of-the-art understanding of NIR detector/PSF systematics, our program will serve as a critical stepping stone for NIR WL science in upcoming surveys, with Euclid and WFIRST. Dr. Bomee Lee has expertise in analysis of HST near-infrared (NIR) data from WFC3, the prime instrument used in this archival proposal, and recently published a paper measuring galaxy shapes in NIR for weak lensing (Lee, Chary, and Wright 2018). As the PI of this proposal, she will be responsible for analyzing the archival data, and leading the writing of documents and papers. Dr. Ranga-Ram Chary is an expert in analysis of cosmological surveys and is the PI of one of the 3 U.S. Science Teams on Euclid. He will be the administrative PI (and co-PI) of this proposal and be responsible for the coordination of activities and distribution of resources to ensure that the goals of this proposal are met. The PI and co-Is are members of the CANDELS and COSMOS-DASH surveys, hence they have access to the data, associated pipelines and the ancillary data e.g. photometric redshifts. Prof. M. James Jee is an expert in weak lensing studies based on space- and ground-based imaging data. His PSF models for ACS and WFC3 have been applied to a number of studies and will be used for this program. He will also lead the shear measurement using SFIT in Phase II. Dr. Charles Shapiro leads the Precision Projector Laboratory, a JPL/Caltech facility that studies the impact of detector-induced errors on precision astronomical measurements. He is an expert on calibration issues with the Hawaii-series of NIR detectors for weak gravitational lensing measurements and will provide his expertise on WFC3 detector systematics in Phase I of this proposal. Dr. Jason Rhodes has led weak lensing campaigns using WFPC2, STIS, and ACS. He is an expert in weak lensing shape measurement techniques, having played a leading role in the Shear Testing Program (STEP) and Gravitational Lensing Accuracy Test (GREAT) processes. He is the JPL WFIRST Project Scientist and the US science lead for the ESA Euclid mission. Prof. Christopher M. Hirata is a cosmologist and a member of Euclid and WFIRST science investigation teams. For this program, he will contribute to investigating systematics and combining images using his IMCOM technique. Dr. Arun Kannawadi leads the weak gravitational pipeline development for Rubin Observatory/LSST Data Management. He has expertise in shear calibration, both with image simulations (GalSim) and Metacalibration. He has experience in dealing with detector effects, particularly with NIR detectors. Dr. Anton M. Koekemoer is an expert in the construction of HST imaging mosaics, and has led innovative techniques to advance the scientific quality of mosaics in many large cosmological surveys (GOODS, COSMOS, HUDF, CANDELS, CLASH, HFF). In this project he will contribute this expertise in the imaging analysis. Dr. Gabriel Brammer is an expert on the ACS and WFC3 instruments, and in computational techniques analyzing HST data, such as a pipeline for COSMOS-DASH. Dr. Ivelina Momcheva has extensive experience with analyzing observations from the WFC3 instrument and has led various aspects of the 3D-HST and COSMOS-DASH surveys. Dr. Peter Taylor is an expert cosmological inference from weak lensing data. In the past he has used HST observations to perform galaxy cluster mass mapping. He will contribute his expertise in Phase II to analyze cosmic shear and produce the weak lensing map. Large Scale Structure of the Universe Galaxies 0 Legacy false false false false false SUPPORTED