Seyfert nuclei as short-lived stochastic accretion events

Details Seyfert nuclei as short-lived stochastic accretion events Seyfert nuclei as short-lived stochastic accretion events

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140...52s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 1, Nov. 1984, p. 52-54.

Astronomy and Astrophysics

Astronomy

11

Accretion Disks, Black Holes (Astronomy), Galactic Nuclei, Seyfert Galaxies, Angular Momentum, Plasma Jets, Tides

Scientific paper

The minimum statistical lifetime of Seyfert activity in a particular galaxy is 3 - 7×108yr. The recent discovery of radio continuum jets in the central regions of Seyferts may constrain the lifetime of individual Seyfert episodes to be shorter than 106yr implying that nuclei evolve through at least 100 recurring Seyfert episodes. If the energy source of Seyfert activity is accretion onto a central black hole, then random jet orientations suggest that each event is accompanied by its own independent accretion disk in no preferred plane (stochastic fueling). The two different types of Seyferts may result from very different time scales for the fueling events.

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