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We investigate the relationship between colour and structure within galaxiesusing a large, volume-limited sample of bright, low-redshift galaxies withoptical to near-infrared imaging from the GAMA survey. We fit single-component,wavelength-dependent, elliptical Sersic models to all passbands simultaneously,using software developed by the MegaMorph project. Dividing our sample bySersic index and colour, the recovered wavelength variations in effectiveradius (R_e) and Sersic index (n) reveal the internal structure, and henceformation history, of different types of galaxies. All these trends depend onn; some have an additional dependence on galaxy colour. Late-type galaxies (n_r< 2.5) show a dramatic increase in Sersic index with wavelength. This might bea result of their two-component (bulge-disk) nature, though stellar populationgradients within each component and dust attenuation are likely to play a role.All galaxies show a substantial decrease in R_e with wavelength. This isstrongest for early-types (n_r > 2.5), even though they maintain constant nwith wavelength, revealing that ellipticals are a superimposition of differentstellar populations associated with multiple collapse and merging events.Processes leading to structures with larger R_e must be associated with lowermetallicity or younger stellar populations. This appears to rule out theformation of young cores through dissipative gas accretion as an importantmechanism in the recent lives of luminous elliptical galaxies.

Galaxy And Mass Assembly (GAMA): the wavelength-dependent sizes and profiles of galaxies revealed by MegaMorph