Derived bolometric luminosity as function of projected distance from the galaxy center. Color circles correspond to the derived luminosity for each aperture along a source, using different colors for each system, as presented in the figure. The different estimates of current L_Bol are marked in the corresponding color for every galaxy; a small offset from the nucleus is added to improve the clarity of the different symbols. Shaded areas of corresponding colors represent the error for each luminosity value derived from MC simulations, as described in the text. There is a clear trend of increasing luminosity with increasing projected distance. This implies a significant change between ∼1–3 dex over ∼10⁴ yr timescales.