Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981natur.294..427s&link_type=abstract
Nature, vol. 294, Dec. 3, 1981, p. 427-429.
Astronomy and Astrophysics
Astronomy
17
Black Holes (Astronomy), Galactic Nuclei, Interstellar Gas, Molecular Clouds, Seyfert Galaxies, Spiral Galaxies, Line Spectra, Molecular Spectra, Stellar Mass Accretion
Scientific paper
A model is proposed for recurring activity in normal galactic nuclei based on the assumed presence of a massive nuclear black hole (approximately 10 to the 7th solar masses) and the observation of a very clumpy distribution of interstellar gas in the inner 200 pc of our Galaxy. It is noted that the system of massive molecular clouds with low net angular momentum could provide an 'accretion event' every 100-million years with a duration of approximately 100,000 years. In such a picture, most spiral-galaxy nuclei evolve through recurring Seyfert episodes of fairly short duration; the 1% accretion duty cycle is roughly consistent with the fact that a few percent of all spiral galaxies are Seyferts.
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