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The roles of ram-pressure stripping and minor mergers in the evolution of galaxies

Published online by Cambridge University Press:  06 October 2004

Takashi Okamoto  and
Masahiro Nagashima
Takashi Okamoto
Affiliation:
Department of Physics, University of Durham, South Road, Durham, DH1 3LE UK email: [email protected] NAOJ, NINIS, Mitaka, Tokyo 181-8588 Japan
Masahiro Nagashima
Affiliation:
Department of Physics, University of Durham, South Road, Durham, DH1 3LE UK email: [email protected] Department of Physics, Kyoto University, Kyoto 606-8502, Japan
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Abstract

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We investigate environmental effects on evolution of bright cluster galaxies in a $\Lambda$-dominated cold dark matter universe using a combination of dissipationless $N$-body simulations and a semi-analytic galaxy formation model. We incorporate effects of ram-pressure stripping (RPS) and minor merger-induced small starburst (minor burst) into our model. By considering minor burst, the observed morphology-radius relation is successfully reproduced. When we do not consider minor burst, the RPS hardly increases the intermediate B/T population. In addition, the RPS and minor burst are not important for colours or star formation rates of galaxies in the cluster core if star formation time-scale is properly chosen, because the star formation is sufficiently suppressed by consumption of the cold gas. We also find that SF in bulge-dominated galaxies is mainly terminated by starburst induced by major mergers in all environments.To search for other articles by the author(s) go to: http://adsabs.harvard.edu/abstract_service.html

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2004 , Issue IAUC195 , March 2004 , pp. 534 - 538
Copyright
© 2004 International Astronomical Union