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Paper: Dry Minor Mergers and Size Evolution of Early-type Galaxies in High Density Environments
Volume: 453, Advances in Computational Astrophysics: Methods, Tools, and Outcome
Page: 373
Authors: Oogi, T.; Habe, A.
Abstract: We investigate the effect of sequential, multiple dry minor mergers on the size evolution of compact massive early-type galaxies (ETGs). We perform N-body simulations of sequential minor mergers, including dark matter and stellar component, and compare properties of the merger remnants of simultaneous minor mergers as in previous studies and of our numerical results with the recent observations of ETGs. We show that the sequential minor mergers are the most efficient in size growth and in decreasing of the velocity dispersion of the stellar system. The evolution of size and velocity dispersion of our model galaxies agrees with the recent observations. We also show that in denser environments, massive galaxies have undergone many minor mergers, by analyzing the Millennium Simulation results. Therefore, our results support that cluster ETGs are counterpart of high-z compact massive ETGs after sequential minor mergers.
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