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In this paper, we demonstrate that the inference of galaxy stellar masses viaspectral energy distribution (SED) fitting techniques for galaxies formed inthe first billion years after the Big Bang carries fundamental uncertaintiesowing to the loss of star formation history (SFH) information from the veryfirst episodes of star formation in the integrated spectra of galaxies. Whilethis early star formation can contribute substantially to the total stellarmass of high-redshift systems, ongoing star formation at the time of detectionoutshines the residual light from earlier bursts, hampering the determinationof accurate stellar masses. As a result, order of magnitude uncertainties instellar masses can be expected. We demonstrate this potential problem viadirect numerical simulation of galaxy formation in a cosmological context. Indetail, we carry out two cosmological simulations with significantly differentstellar feedback models which span a significant range in star formationhistory burstiness. We compute the mock SEDs for these model galaxies at z=7via 3D dust radiative transfer calculations, and then backwards fit these SEDswith Prospector SED fitting software. The uncertainties in derived stellarmasses that we find for z>7 galaxies motivate the development of new techniquesand/or star formation history priors to model early Universe star formation.

Outshining by Recent Star Formation Prevents the Accurate Measurement of High-z Galaxy Stellar Masses