We present the star formation history (SFH) of the Sculptor dwarf
spheroidal galaxy based on deep g, r photometry taken with Dark Energy
Camera at the Blanco telescope, focusing our analysis on the central
region of the galaxy extended up to ˜3 core radii. We have
investigated how the SFH changes radially, subdividing the sampled area
into four regions, and have detected a clear trend of star formation.
All the SFHs show a single episode of star formation, with the innermost
region presenting a longer period of star formation of ˜1.5 Gyr
and for the outermost region the main period of star formation is
confined to ˜0.5 Gyr. We observe a gradient in the mean age which
is found to increase going towards the outer regions. These results
suggest that Sculptor continued forming stars after the reionization
epoch in its central part, while in the peripheral region, the majority
of stars probably formed during the reionization epoch and soon after
its end. From our analysis, Sculptor cannot be considered strictly as a
fossil of the reionization epoch.