2021/11/29 by Sam E. Cutler, Katherine E. Whitaker, Lamiya A. Mowla +16
Physics and Astronomy · #astro-ph.GA
paper · pdf · doi:10.3847/1538-4357/ac341c
27 pages, 17 figures. Accepted for publication in ApJ. For associated morphological catalog, see https://archive.stsci.edu/hlsp/cosmos-dash
arxiv created 2021/11/29 · arxiv updated 2022/02/02
We present the H160 morphological catalogs for the COSMOS-DASH survey, the largest area near-IR survey using HST-WFC3 to date. Utilizing the "Drift And SHift" observing technique for HST-WFC3 imaging, the COSMOS-DASH survey imaged approximately 0.5 deg2 of the UltraVISTA deep stripes (0.7 deg2 when combined with archival data). Global structural parameters are measured for 51,586 galaxies within COSMOS-DASH using GALFIT (excluding the CANDELS area) with detection using a deep multi-band HST image. We recover consistent results with those from the deeper 3D-HST morphological catalogs, finding that, in general, sizes and Sérsic indices of typical galaxies are accurate to limiting magnitudes of H160<23 and H160<22 ABmag, respectively. In size-mass parameter space, galaxies in COSMOS-DASH demonstrate robust morphological measurements out to z∼2 and down to log(M_⋆/M_\odot)∼9. With the advantage of the larger area of COSMOS-DASH, we measure a flattening of the quiescent size-mass relation below log(M_⋆/M_\odot)∼10.5 that persists out to z∼2. We show that environment is not the primary driver of this flattening, at least out to z=1.2, whereas internal physical processes may instead govern the structural evolution.