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The Local Group Dwarf Spheroidal Galaxies: A Key to Building Blocks in the Universe

Published online by Cambridge University Press:  26 May 2016

Hiroyuki. Hirashita
Affiliation:
Department of Astronomy, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
Naoyuki. Tamura
Affiliation:
Department of Astronomy, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
Tsutomu T. Takeuchi
Affiliation:
Division of Particle and Astrophysical Sciences, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan

Abstract

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Recent studies have been revealing the properties of dwarf spheroidal galaxies (dSphs). Their low mass indicates that the dSphs may provide a clue to physical properties of the building blocks in the hierarchical structure formation. We select the Local Group dSphs as a sample. To obtain the information on the star formation history of dSphs, we investigate the relation between their metallicity and virial mass. According to our scenario, the star formation efficiency of the dSphs is low because of strong regulation. This is consistent with their high mass-to-light ratios. We also comment on the environmental effects on the dSphs.

Type
Part XII: Poster Papers
Copyright
Copyright © Astronomical Society of the Pacific 2005 

References

Hirashita, H., Kamaya, H. & Mineshige, S. 1997, MNRAS, 290, L33.CrossRefGoogle Scholar
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Tamura, N. & Hirashita, H. 1999, ApJ, 525, L17.CrossRefGoogle Scholar
Tamura, N., Hirashita, H. & Takeuchi, T. T. 2000, ApJ, submitted.Google Scholar
van den Bergh, S. 1994, ApJ, 428, 617.CrossRefGoogle Scholar
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