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K. M. Lanzetta (State University of New York at Stony Brook)
We report on our effort to establish properties of the very high redshift galaxy population by applying optimal photometry and photometric redshift techniques to the HDF and HDF--S WFPC2 and NICMOS fields. We find that cosmological surface brightness dimming effects play a dominant role in setting what is observed at redshifts z > 2, that the comoving number density of high intrinsic surface brightness regions increases monotonically with increasing redshift, and that previous estimates neglect a significant or dominant fraction of the ultraviolet luminosity density of the universe due to surface brightness effects. We present evidence of a population of luminous galaxies of redshift z > 10. We argue that the ultraviolet luminosity density of the universe plausibly increases monotonically with increasing redshift to the highest redshifts yet observed.