Diagnosing DASH: A Catalog of Structural Properties for the COSMOS-DASH Survey

Abstract

We present the $H_{160}$ 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 deg${}^2$ of the UltraVISTA deep stripes (0.7 deg${}^2$ 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 $H_{160}<23$ and $H_{160}<22$ ABmag, respectively. In size-mass parameter space, galaxies in COSMOS-DASH demonstrate robust morphological measurements out to $z\sim 2$ and down to $\log (M_{\star }/M_{\odot })\sim 9$. With the advantage of the larger area of COSMOS-DASH, we measure a flattening of the quiescent size-mass relation below $\log (M_{\star }/M_{\odot })\sim 10.5$ that persists out to $z\sim 2$. 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.

27 pages, 17 figures. Accepted for publication in ApJ. For associated morphological catalog, see https://archive.stsci.edu/hlsp/cosmos-dash

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