The relation between variability and star formation in Seyfert nuclei.

The central hypothesis of this paper is that nuclear starbursts can reproduce the observed properties of Seyfert nuclei. The authors suggest that the so called Broad emission Line Region (BLR) observed in Seyfert type I nuclei may be young supernova remnants evolving in the high density nuclear inter-stellar medium. The observed properties of the BLR (size, total energy, density, line widths) correspond to the expectations of the model. More importantly, the observed optical variability properties of the BLR strongly suggest the SN origin.