Environmental effects on Seyfert Galaxies

Details Environmental effects on Seyfert Galaxies Environmental effects on Seyfert Galaxies

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8730228k&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Aerospace Environments, Collisional Plasmas, Galactic Nuclei, Seyfert Galaxies, Statistical Analysis, Accretion Disks, Astronomical Models, Black Holes (Astronomy), Companion Stars, Quasars, Stellar Luminosity

Scientific paper

A statistical analysis of the environmental effects on Seyfert galaxies (SGs) is presented. Two samples are analyzed; the first comprises 282 SGs known until 1983 and the second is a subsample selected in an unbiased way. The distance of the Seyfert to its nearest galaxy was compared to the similar parameter of a control sample. It was also compared to an artificial sample obtained by numerical simulation. The main conclusions of the analysis are: (1) 40 percent of the SGs have a companion galaxy closer as compared to non-Seyfert galaxies; (2) low luminosity Seyfert nuclei seem to have companions more frequently than high luminosity ones; (3) extrapolating the results to quasars, it is predicted that about 25 percent of them should be triggered by galaxy collisions; (4) these results are interpreted in terms of the canonical model of accreting supermassive black holes in the nuclei of galaxies. It is proposed that tidal galaxy collisions enhance the accretion rate of the interstellar gas into the central black hole; and (5) the tidal radius for triggering the Seyfert phenomenon is 400 kpc.

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