  In order to reveal the stellar mass distribution of z~3 galaxies, we are
conducting deep imaging observations of U-dropout Lyman Break Galaxies (LBGs)
with Adaptive Optics (AO) systems in K-band, which corresponds to rest-frame
V-band of z~3 galaxies. The results of the Subaru intensive-program
observations with AO36/NGS/IRCS indicate that 1) the K-band peaks of some of
the LBGs brighter than K=22.0 mag show significant offset from those in the
optical images, 2) the z~3 Mv* LBGs and serendipitously observed Distant Red
Galaxies (DRGs) have flat profiles similar to disk galaxies in the local
universe (i.e., Sersic with n<2), and 3) the surface stellar mass densities of
the Mv* LBGs are 3-6 times larger than those of disk galaxies at z=0-1.
Considering the lack of n>2 systems among the luminous z~3 LBGs and DRGs, and
their strong spatial clustering, we infer that the dense n<2 disk-like
structures evolve into the n>2 spheroids of nearby galaxies through relaxations
due to major merger events.
