The authors re-discuss the starburst scenario for nuclear activity and show that the Hubble type distribution of parent galaxies, the total luminosity, the radio and X-ray luminosities, the emission line ratios and line widths and the characteristics of the optical continuum of Seyfert 2 and Liners all agree with the predictions of the Starburst-Warmer model. The Hubble type distribution dichotomy arises naturally in the Starburst-Warmer scenario and is in fact rooted in the differences of metal abundances for galaxies of different Hubble type. The authors also show that the observed characteristics (i.e., luminosity, line widths and variability time-scale) of the broad line region in AGNs seem consistent with being originated in supernova flashes and supernova remnants evolving in high density environment.
Observational Evidence of Activity in Galaxies
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