Proc. IAU volume 13, issue S334, P319-320 2017 DOI: 10.1017/s1743921317008456 View full text
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Yutaka Komiyama

Abstract: AbstractWe have carried out an imaging survey for Local Group dwarf spheroidal galaxy Ursa Minor (UMi) using Hyper Suprime-Cam (HSC) on the 8.2m Subaru Telescope. Wide and deep data obtained by HSC enable us to investigate the extent of UMi which is revealed to extend out to twice the nominal tidal radius. The fraction of binary systems is also investigated from the morphology of the main sequence and estimated to be ~0.4.