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Evolution of dwarf galaxies in a semi-analytic galaxy formation model

Published online by Cambridge University Press:  30 October 2019

Masahiro Nagashima
Affiliation:
Faculty of Education, Bunkyo University, Koshigaya, Saitama 343-8511, Japan † email: masahiro@koshigaya.bunkyo.ac.jp
Motohiro Enoki
Affiliation:
Faculty of Business Administration, Tokyo Keizai University, Kokubunji, Tokyo 185-8502, Japan
Tomoaki Ishiyama
Affiliation:
Institute of Management and Information Technologies, Chiba University, Chiba, Chiba 263-8522, Japan
Masakazu A. R. Kobayashi
Affiliation:
Faculty of Natural Sciences, National Institute of Technology, Kure College, Kure, Hiroshima 737-8506, Japan
Ryu Makiya
Affiliation:
Kavli Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Chiba 277-8583, Japan
Kazuyuki Ogura
Affiliation:
Faculty of Education, Bunkyo University, Koshigaya, Saitama 343-8511, Japan † email: masahiro@koshigaya.bunkyo.ac.jp
Takashi Okamoto
Affiliation:
Department of Cosmosciences, Graduate School of Science, Hokkaido Univeristy, Sapporo, Hokkaido 060-0810, Japan
Katsuya Okoshi
Affiliation:
Tokyo University of Science, Oshamanbe-cho, Yamakoshi-gun, Hokkaido 049-3514, Japan
Taira Oogi
Affiliation:
Kavli Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Chiba 277-8583, Japan
Hikari Shirakata
Affiliation:
Department of Cosmosciences, Graduate School of Science, Hokkaido Univeristy, Sapporo, Hokkaido 060-0810, Japan
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Abstract

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Dwarf galaxies provide us many important clues to understanding of galaxy formation. By using the current version of our own semi-analytic model of galaxy formation, in which cosmic structure forms and evolves based on the cold dark matter model of cosmology, we analyze dwarf galaxies. We find that the model well reproduces many properties such as magnitudes, sizes, and velocity dispersions of, especially, dwarf elliptical galaxies. We also find that the dynamical response of the gravitational potential well of dwarf galaxies to the supernova-induced gas removal plays a very important role to obtain large sizes and small velocity dispersions as observed.

Type
Contributed Papers
Copyright
© International Astronomical Union 2019 

References

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