D ec 1 99 8 Evolutionary Baldwin Effect in AGN

Assuming Active Galactic Nuclei are powered by accretion onto a massive black hole we suggest that the growth of the central black hole mass due to the matter accreted over the AGN lifetime causes evolution of the luminosity and spectrum. We show that the effective temperature of the UV continuum spectrum is likely to be anti-correlated with the black hole mass and with the luminosity. We estimate the change in the equivalent width of the emission lines due to the growth of the black hole and show that for plausible evolutionary tracks and effective temperature models the equivalent width is anti-correlated with continuum luminosity thus implying an evolutionary origin to the Baldwin effect.