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

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

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..399..469o&link_type=abstract

Panoramic Views of Galaxy Formation and Evolution ASP Conference Series, Vol. 399, proceedings of the conference held 11-16 Dece

Physics

2

Scientific paper

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.

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