The star formation history of the Sculptor dwarf spheroidal galaxy
  We present the star formation history (SFH) of the Sculptor dwarf spheroidal
galaxy based on deep g,r photometry taken with DECam at the Blanco telescope,
focusing our analysis on the central region of the galaxy extended up to $\sim
3$ 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 $\sim 1.5$ Gyr
and for the outermost region the main period of star formation is confined to
$\sim 0.5$ 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 can not
be considered strictly as a fossil of the reionization epoch.
