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Shock-induced star cluster formation in colliding galaxies

Published online by Cambridge University Press:  27 April 2011

Takayuki R. Saitoh ,
Hiroshi Daisaka ,
Eiichiro Kokubo ,
Junichiro Makino ,
Takashi Okamoto ,
Kohji Tomisaka ,
Keiichi Wada  and
Naoki Yoshida
Takayuki R. Saitoh
Affiliation:
Division of Theoretical Astronomy, National Astronomical Observatory of Japan, 2–21–1 Osawa, Mitaka-shi, Tokyo 181–8588
Hiroshi Daisaka
Affiliation:
Graduate School of Commerce and Management, Hitotsubashi University, Naka 2–1 Kunitachi-shi, Tokyo 186–8601
Eiichiro Kokubo
Affiliation:
Division of Theoretical Astronomy, National Astronomical Observatory of Japan, 2–21–1 Osawa, Mitaka-shi, Tokyo 181–8588 Center for Computational Astrophysics, National Astronomical Observatory of Japan, 2–21–1 Osawa, Mitaka-shi, Tokyo 181–8588 School of Physical Sciences, Graduate University of Advanced Study (SOKENDAI), 2–21–1 Osawa, Mitaka-shi, Tokyo 181–8588
Junichiro Makino
Affiliation:
Division of Theoretical Astronomy, National Astronomical Observatory of Japan, 2–21–1 Osawa, Mitaka-shi, Tokyo 181–8588 Center for Computational Astrophysics, National Astronomical Observatory of Japan, 2–21–1 Osawa, Mitaka-shi, Tokyo 181–8588 School of Physical Sciences, Graduate University of Advanced Study (SOKENDAI), 2–21–1 Osawa, Mitaka-shi, Tokyo 181–8588
Takashi Okamoto
Affiliation:
Center for Computational Sciences, University of Tsukuba 1–1–1, Tennodai, Tsukuba, Ibaraki 305–8577, Japan
Kohji Tomisaka
Affiliation:
Division of Theoretical Astronomy, National Astronomical Observatory of Japan, 2–21–1 Osawa, Mitaka-shi, Tokyo 181–8588 Center for Computational Astrophysics, National Astronomical Observatory of Japan, 2–21–1 Osawa, Mitaka-shi, Tokyo 181–8588 School of Physical Sciences, Graduate University of Advanced Study (SOKENDAI), 2–21–1 Osawa, Mitaka-shi, Tokyo 181–8588
Keiichi Wada
Affiliation:
Center for Computational Astrophysics, National Astronomical Observatory of Japan, 2–21–1 Osawa, Mitaka-shi, Tokyo 181–8588 Graduate School of Science and Engineering, Kagoshima University, 1–21–30 Korimoto, Kagoshima, Kagoshima 890–8580
Naoki Yoshida
Affiliation:
Institute for the Physics and Mathematics of the Universe, University of Tokyo, 5–1–5 Kashiwanoha, Kashiwa, Chiba 277–8568, Japan email: saitoh.takayuki@nao.ac.jp
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Abstract

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We studied the formation process of star clusters using high-resolution N-body/smoothed particle hydrodynamics simulations of colliding galaxies. The total number of particles is 1.2×108 for our high resolution run. The gravitational softening is 5 pc and we allow gas to cool down to ~10 K. During the first encounter of the collision, a giant filament consists of cold and dense gas found between the progenitors by shock compression. A vigorous starburst took place in the filament, resulting in the formation of star clusters. The mass of these star clusters ranges from 105−8M⊙. These star clusters formed hierarchically: at first small star clusters formed, and then they merged via gravity, resulting in larger star clusters.

Keywords

galaxies: star clusters — galaxies: starburst — galaxies: evolution — ISM: evolution — methods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S270: Computational Star Formation , May 2010 , pp. 483 - 486
Copyright
Copyright © International Astronomical Union 2011

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