Everything Every Band All at Once I: A Global Morphology Catalog in Abell 2744 based on UNCOVER/MegaScience

Abstract

We present spectrally-resolved structural parameter measurements of 28,274 sources from the legacy lensing field of Abell 2744, quantifying global structures from observed $0.7\mu m-4.8\mu m$ and spanning rest-frame UV to NIR at $R\sim 15$. These measurements are made on imaging mosaics mainly from the UNCOVER/MegaScience survey, including 20 JWST NIRCam broad and medium bands. We perform single-component Sérsic fitting to these galaxies using \texttt{pysersic}, a Bayesian structural fitting tool, to infer their structural parameters and associated random uncertainties from the posterior distributions. Through various quality evaluation criteria, we infer robust structural parameters among $>85\%$ of the selected $\mathrm{SNR}>10$ sources. For each galaxy with reliable sizes in at least two bands and a high quality redshift, we fit its observed size as a function of wavelength and infer rest-frame UV, optical, and near-infrared sizes where applicable. By performing injection-recovery tests on simulated galaxy cutouts in selected bands, we establish that our structural parameter measurements achieve fractional error $<10-20\%$ above $\mathrm{SNR}>10$. With this paper, all raw structural measurements and fitted rest-frame sizes are quality-flagged, cataloged, and released to the community. Finally, we demonstrate that this catalog enables the structural study of galaxies over an unprecedentedly wide parameter space of redshift ($0.3<z<8$), stellar mass ($10^7{\mathrm{M}}_{\odot }<{\mathrm{M}}_{\ast }<10^{11.5}{\mathrm{M}}_{\odot }$), and rest-frame optical size ($100\mathrm{pc}<{\mathrm{R}}_{\mathrm{e}}<10\mathrm{kpc}$), after correcting for lensing magnification.

28 pages, 12 figures

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