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The Star Formation History and Stellar Population Structures in the Sextans Dwarf Spheroidal Galaxy

Bibcode
2008ASPC..399..469O
Okamoto, S.; Arimoto, N.; Yamada, Y.; Onodera, M.; Tolstoy, E.; Irwin, M.; Helmi, A.; Battaglia, G.; Jablonka, P.; Hill, V.; Venn, K.; Shetrone, M.; Letarte, B.; Primas, F.; Francois, P.; Sadakane, K.; Kaufer, A.; Szeifert, T.; Abel, T.
Bibliographical reference

Panoramic Views of Galaxy Formation and Evolution ASP Conference Series, Vol. 399, proceedings of the conference held 11-16 December, 2007, at Shonan Village Center, Hayama, Japan. Edited by Tadayuki Kodama, Toru Yamada, and Kentaro Aoki. San Francisco: Astronomical Society of the Pacific, 2008., p.469

Advertised on:
10
2008
Number of authors
19
IAC number of authors
0
Citations
4
Refereed citations
4
Description
We present V, I CCD photometry of the Sextans dwarf spheroidal galaxy (dSph) in the Local Group. Images of the galaxy were taken by Suprime-Cam on Subaru, covering 26 fields extended to the tidal radius. The color-magnitude diagrams extending two magnitudes below the main-sequence turnoff (MSTO) show a steep red giant branch (RGB), blue and red horizontal branch (HB), blue stragglers, and main-sequence (MS) stars. From the luminosity difference between the HB and the MSTO, we estimate the ages of the galaxy's stellar populations. We find that the relatively younger stars (˜10Gyr) are more spatially concentrated toward the galaxy center than old stars (˜14Gyr), which indicates that the star formation in the central region continued at least a few Gyr. This is consistent with the different spatial distributions of red and blue HB stars. The long duration of the star-formation period in the central region of the galaxy is possibly related to dissipative gas physics during the epoch of post-reionization evolution, or to the accretion history of satellites.
Type
Non-refereed

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