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We carried out a wide-field V, I imaging survey of the Local Group dwarfspheroidal galaxy Leo II using the Subaru Prime Focus Camera on the 8.2-mSubaru Telescope. The survey covered an area of 26.67 x 26.67 arcmin^2, farbeyond the tidal radius of Leo II (8.63 arcmin), down to the limiting magnitudeof V ~26, which is roughly 1 mag deeper than the turn-off point of the mainsequence stars of Leo II. Radial number density profiles of bright and faintred giant branch (RGB) stars were found to change their slopes at around thetidal radius, and extend beyond the tidal radius with shallower slopes. Asmoothed surface brightness map of Leo II suggests the existence of a smallsubstructure of globular cluster luminosity beyond the tidal radius. Weinvestigated the properties of the stellar population by means of thecolor-magnitude diagram. The horizontal branch (HB) morphology index shows aradial gradient in which red HB stars are more concentrated than blue HB stars,which is common to many Local Group dwarf spheroidal galaxies. The colordistribution of RGB stars around the mean RGB sequence shows a largerdispersion at the center than in the outskirts, indicating a mixture of stellarpopulations at the center and a more homogeneous population in the outskirts.Based on the age estimation using subgiant branch (SGB) stars, we found thatalthough the major star formation took place ~8 Gyr ago, a considerable stellarpopulation younger than 8 Gyr is found at the center; such a younger populationis insignificant in the outskirts.

Wide-field Survey around Local Group Dwarf Spheroidal Galaxy Leo II: Spatial Distribution of Stellar Content