Comparing Stellar Masses Inferred Using HST and JWST Data in A2744

Abstract We analyze stellar mass estimates from James Webb Space Telescope (JWST) and Hubble Space Telescope (HST) photometry, examining discrepancies driven by dust extinction, metallicity, age, and attenuation. Using cross-matched catalogs from the Hubble Frontier Fields and the JWST UNCOVER survey, we construct a homogeneous sample of dwarf galaxies in A2744 with photometric redshifts within z = 0.308 and stellar masses below 10 9.5 M ⊙ . While masses are generally consistent between observatories, JWST yields higher estimates in high-extinction, high-metallicity regions, consistent with its infrared sensitivity capturing stellar populations obscured or underestimated in HST-based measurements. Linear regression of age, metallicity, and dust confirms parameter-dependent trends in mass ratios despite low overall correlations. These findings highlight the importance of infrared data for stellar mass determinations and JWST’s role in understanding low-mass galaxy evolution.