Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...171...16b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 171, no. 1-2, Jan. 1987, p. 16-24. Research supported by the Academy of Finlan
Astronomy and Astrophysics
Astrophysics
69
Galactic Clusters, Galactic Evolution, Many Body Problem, Quasars, Seyfert Galaxies, Tides, Disk Galaxies, Galactic Nuclei, Magnetohydrodynamic Stability
Scientific paper
In a previous paper the authors have shown with computer models that observed companion galaxies are sufficient to induce gravitational instability in a disk galaxy. The instability leads to inflow of matter into the nuclear region and possibly to Seyfert activity. Here it is shown first that when selection effects have been properly taken into account, the fraction of Seyfert galaxies which are found in multiple systems is at least 3/4 and possibly higher. Moreover, the Hubble types of the few isolated Seyferts are consistent with their being results of recent galaxy mergers. Next, the authors ask why all disk galaxies in multiple systems are not Seyferts. The simulations indicate that major reasons may be: (1) a "latency period" after the onset of strong tidal force before infalling material reaches the nucleus and (2) the episodic nature of the inflow.
Byrd Gene Gilbert
Sundelius Bjorn
Valtonen Mauri
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