Tracing black hole accretion with SED decomposition and IR lines: from local galaxies to the high-z Universe Dahkki Gruppioni, C, Berta, S, Spinoglio, L, Pereira-Santaella, M, Pozzi, F, Andreani, P, Bonato, M, De Zotti, G, Malkan, M, Negrello, M, Vallini, L, Vignali, C