Taira OOGI
(Center for Computational Astrophysics, NAOJ)
We investigate the effects of dry mergers on the size evolution of compact massive early-type galaxies with N-body simulations, focusing particularly on the effects of sequential dry minor mergers. We show that sequential minor mergers of compact satellite galaxies lead to the most efficient size growth and the most efficient decrease of velocity dispersion. The maximum size growth efficiency is much higher than a simple analytical estimation. Furthermore, we use a high-resolution cosmological N-body simulation to explore the size and mass growth of early-type galaxies in high density environments. We will show the evolution of the stellar mass-size relation.