IAU Symposium Abstract S186-056P


On the Universality of the M-sigma relation of Ellipticals


Y. Funato1 and J. Makino2
1 Univ. of Tokyo, Tokyo, Japan, < funato@chianti.c.u-tokyo.ac.jp >
2 Univ. of Tokyo, Tokyo, Japan, < makino@grape.c.u-tokyo.ac.jp >



We studied the evolution of structure of galaxies through many encounters between two galaxies. From the result, we found that the individual galaxies evolve so as to satisfy the relation M proportional to sigma4 through interations with each other in galaxy clusters. Firstly, we present the result of numerical experiment of an encounter of two galaxies. Scondly, we show a semi-analytic study on the evolution of structure of ellipticals in galaxy clusters, where galaxies suffer from frequent encounters with each other. As a result, we derived the relation M proportional to sigma4 as a steady state of ellipticals in a cluster environment.