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We present the deep and wide $V$ and $I_c$ photometry of the Sextans dwarfspheroidal galaxy (dSph) taken by Suprime-Cam imager on the Subaru Telescope,which extends out to the tidal radius. The colour-magnitude diagram (CMD)reaches two magnitudes below the main sequence (MS) turn-off, showing a steepred giant branch, blue and red horizontal branch (HB), sub-giant branch (SGB),MS, and blue stragglers (BS). We construct the radial profile of eachevolutionary phase and demonstrate that blue HB stars are more spatiallyextended, while red HB stars are more centrally concentrated than the othercomponents. The colour distribution of SGB stars also varies with thegalactocentric distance; the inner SGB stars shift bluer than those in theoutskirt. The radial differences in the CMD morphology indicate the existenceof the age gradient. The relatively younger stars ($\sim10$ Gyr) are morecentrally concentrated than the older ones ($\sim13$ Gyr). The spatial contourmaps of stars in different age bins also show that the younger population hashigher concentration and higher ellipticity than the older one. We also detectthe centrally concentrated bright BS stars, the number of which is consistentwith the idea that a part of these stars belongs to the remnant of a disruptedstar cluster discovered in the previous spectroscopic studies.

Population gradient in Sextans dSph: Comprehensive mapping of a dwarf galaxy by Suprime-Cam