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In order to probe the inside-out formation of the most massive galaxies inthe Universe, we have explored the radial (0.1 < R < 8 kpc) variation of thespectral energy distribution (SED) of M87 from UV to IR. For this purpose, wehave combined high resolution data in 16 different bands. Our analysis indicatethat the age of the stellar population of M87 remains almost unchanged withradius. However, the metallicity ([Z/H]) profile presents three differentzones: the innermost kpc shows a plateau with supersolar metallicity, followedby a decline in metallicity down to 5 kpc and another plateau afterwards. Thesize of the inner plateau is similar to the expected size (Re) of an objectwith the predicted mass of M87 at z=2. The global [Z/H] gradient is -0.26 +-0.10, similar to those found in other nearby massive ellipticals. The observedchange in the stellar population of M87 is consistent with a rapid formation ofthe central part (R<5 kpc) of this galaxy followed by the accretion of theouter regions through the infall of more metal-poor material.

Age and metallicity gradients support hierarchical formation for M87