期刊
ASTRONOMY & ASTROPHYSICS
卷 421, 期 2, 页码 583-593出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20035925
关键词
galaxies : elliptical and lenticular; cD; galaxy : evolution; galaxies : interactions; galaxies : kinematics and dynamics
By means of simple numerical models we discuss whether collisionless stellar evaporation from cluster elliptical galaxies could be an effective mechanism for the production of intracluster stellar populations. The effectiveness of this mechanism is due to the fact that, for realistic galaxy and cluster models, the galaxy oscillation periods near equilibrium configurations in the cluster tidal field are of the same order of stellar orbital times in the external parts of the galaxies themselves. With the aid of Monte-Carlo simulations we explore the evolution of stellar orbits in oscillating galaxies placed near different equilibrium positions. We found that, over an Hubble time, the main effect is a substantial expansion of the galactic outskirts, particularly affecting the galaxy at the cluster center and those orbiting near the cluster core radius: overall, approximately the 10% of the galaxy mass is affected. Thus, the proposed mechanism could be of some importance in the shaping of the halo of cD galaxies and in making easier galaxy harassment in the formation of the intracluster stellar population.
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