Active Galactic Nuclei pp 427-429
Evolutionary sequence of Seyfert galaxies
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- Blank D.L., Soker N. (1988) Evolutionary sequence of Seyfert galaxies. In: Miller H.R., Wiita P.J. (eds) Active Galactic Nuclei. Lecture Notes in Physics, vol 307. Springer, Berlin, Heidelberg
We suggest that there exists an evolutionary sequence from Seyfert 2 to Seyfert 1 galaxies. We review observations which support this suggestion and the idea that the main parameter is the dust content in and around the Broad Line Region (BLR). We propose that Seyfert 2 galaxies evolve into Seyfert 1 Galaxies by expelling the dust from the BLR. It is further supposed that the dust is due to the interaction of the host galaxy with a second galaxy. The amount of dust needed is less than that found in a typical spiral galaxy.
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