Genel et al.
The authors use the Millennium Simulation to extract merger fractions and
mass accretion rates. They find that the accretion rates are sufficient to
account for the high star formation rates observed in z~2 UV-optically selected disks.
(not in figure) When following the fate of these disks and submm galaxies, they find that subsequent mergers are not frequent enough to either convert all disks into elliptical galaxies at z~0, or transform all submm galaxies to massive cluster ellipticals at z~0. They conclude that secular and internal evolution must play an important role in the evolution of these z~2 galaxies