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Early photometric results from JWST have revealed a number of galaxycandidates above redshift 10. The initial estimates of inferred stellar massesand the associated cosmic star formation rates are above most theoretical modelpredictions up to a factor of 20 in the most extreme cases, while this has beenmoderated after the recalibration of NIRCam and subsequent spectroscopicdetections. Using these recent JWST observations, we use galaxy scalingrelations from cosmological simulations to model the star formation history tovery high redshifts, back to a starting halo mass of 10^7 solar masses, toinfer the intrinsic properties of the JWST galaxies. Here we explore thecontribution of supermassive black holes, stellar binaries, and an excess ofmassive stars to the overall luminosity of high-redshift galaxies. Despite theaddition of alternative components to the spectral energy distribution, we findstellar masses equal to or slightly higher than previous stellar massestimates. Most galaxy spectra are dominated by the stellar component, and theexact choice for the stellar population model does not appear to make a majordifference. We find that four of the 12 high-redshift galaxy candidates arebest fit with a non-negligible active galactic nuclei component, but theevidence from the continuum alone is insufficient to confirm their existence.Upcoming spectroscopic observations of z > 10 galaxies will confirm thepresence and nature of high-energy sources in the early universe and willconstrain their exact redshifts.

Inferred galaxy properties during Cosmic Dawn from early JWST photometry results