The morphological segregation of galaxies has been profusely studied in the literature, with the early-type fraction increasing with luminosity, stellar mass, and local density, and decreasing with redshift. Moreover, the structural properties of galaxies also depends on stellar mass and redshift, providing valuable constraints to the galaxy formation physics.

The J-PAS will observe each galaxy with 56 optical bands, and the morphological and structural information encoded in each band is different, with bluer filters being sensitive to the young stellar populations and the redder filters to the old stellar component. Thus, a structural study based in the simultaneous analysis of several J-PAS filters is needed to fully exploit the data. The code MEGAMORPH (Häussler+13, Vika+13) covers all the items for a multi-filter estimation of structural parameters. MEGAMORPH uses a smooth transition of galaxy parameters with wavelength, creating more physically meaningful transitions than single-band fitting and allows accurate interpolation between pass-bands. MEGAMORPH is the starting point of PROFUSE to perform a multi-filter estimation of structural parameters in the J-PAS galaxies located at z < 0.3.

PHASE: Definition phase.