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Astron. Astrophys. 335, 912-918 (1998)

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Seyfert galaxies and environment: Seyferts in galaxy pairs and groups *

B. Kelm, P. Focardi and G.G.C. Palumbo

Dipartimento di Astronomia, Universitá di Bologna V. Zamboni 33, I-40100 Bologna, Italy

Received 20 May 1997 / Accepted 14 April 1998


The occurrence of Seyfert galaxies in 6 samples representative of different cosmological environments (i.e. isolated pairs, compact and loose groups) is analysed. To avoid biases linked to subjective sample selection criteria only canonical samples, taken from the literature, are considered.

It is found that the average frequency of Seyferts in all samples, is near 2%. Most Seyferts lying in pairs and compact groups show disturbed morphological appearance, whilst in loose groups disturbed and "isolated" Seyferts have roughly the same proportion.

Then, within each sample, structures which host a Seyfert are compared to structures which do not. No appreciable differences regarding dynamical properties are found.

Key words: galaxies: interactions – galaxies: Seyfert

* Tables 1 to 6 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsweb.u-strasbg.fr/Abstract.html

Send offprint requests to: P. Focardi

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© European Southern Observatory (ESO) 1998

Online publication: June 26, 1998