Abstract
We exploit James Webb Space Telescope (JWST) NIRCam observations from the
GLASS-JWST-Early Release Science program, to investigate galaxy stellar masses
at z>7. We first show that JWST observations reduce the uncertainties on the
stellar mass by a factor 5-10, when compared with the highest quality data sets
available to date. We then study the UV mass-to-light ratio, finding that
galaxies exhibit a wide range of $M/L_UV$ values for a given luminosity,
indicative of a broad variety of physical conditions and star formation
histories. As a consequence, previous estimates of the cosmic star stellar mass
density - based on an average correlation between UV luminosity and stellar
mass - can be biased by as much as a factor of 6. Our first exploration
demonstrates that JWST represents a new era in our understanding of stellar
masses at z>7, and therefore of the growth of galaxies prior to cosmic
reionization.
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