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F.R. Marleau (Inst. of Astronomy, Univ. of Cambridge), L. Simard (UCO/Lick Obs.)
We present the results of our quantitative morphological analysis of the galaxies in the Hubble Deep Field - North (HDF-N). Our structural parameters are based on a two-component surface brightness made up of a Sérsic profile and an exponential profile and obtained from the drizzled F606W and F814W images. Our PSF-convolved bulge/disk surface brightness model fits permit us to distinguish between disk and bulge dominated systems. We find that only 8% of the HDF-N F814W galaxies down to mF814W(AB) = 26.0 are bulge dominated. Our parameter distributions are corrected for the galaxy selection function. The morphology of galaxies can appear strikingly dissimilar at different observed wavelengths (and, likewise, at different redshifts when observed in the same passband). To quantify this difference, we compare the quantitative parameters derived from the F606W and F814W images. We combine our observed structural parameters with existing photometric and spectroscopic redshift catalogs to convert them to physical quantities and characterize the evolution of galaxies in terms of their colors, sizes and magnitudes. We discuss the paucity of early-type galaxies in the HDF-N and the deficit of galaxies with extremely red colors.