천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제42권2호
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- Pages.46.1-46.1
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- 2017
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- 1226-2692(pISSN)
Evolution of late-type galaxies in cluster environment: Effects of high-speed multiple interactions with early-type galaxies
- Hwang, Jeong-Sun (Department of Physics and Astronomy, Sejong University) ;
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Park, Changbom
(School of Physics, Korea Institute for Advanced Study) ;
- Banerjee, Arunima (Indian Institute of Science Education and Research) ;
- Hwang, Ho Seong (Quantum Universe Center, Korea Institute for Advanced Study)
- 발행 : 2017.10.10
초록
Late-type galaxies falling into a cluster would evolve being influenced by the interactions with both the cluster and the nearby cluster member galaxies. Most numerical studies, however, tend to focus on the effects of the former with little work done on those of the later. We thus perform numerical study on the evolution of a late-type galaxy falling radially toward the cluster center interacting with neighbouring early-type galaxies, using N-body, hydrodynamical simulations. Based on the information about the typical galaxy encounters obtained by using the galaxy catalog of Coma cluster, we run the simulations for the cases where a Milky Way Galaxy-like late-type galaxy, flying either edge-on or face-on, experiences six consecutive collisions with twice more massive early-type galaxies having hot gas in their halos. Our simulations show that the evolution of the late-type galaxy can be significantly affected by the high-speed multiple collisions with the early-type galaxies, such as on the cold gas content and the star formation activity, particularly through the hydrodynamic interactions between the cold disk and the hot gas halos. By comparing our simulation results with those of others, we claim that the role of the galaxy-galaxy interactions on the evolution of late-type galaxies in clusters could be comparable with that of the galaxy-cluster interactions, depending on the dynamical history.
키워드