Seyfert galaxies in UZC-Compact Groups

Free access article

Issue		A&A Volume 418, Number 1, April IV 2004


Page(s)		25 - 32
Section		Extragalactic astronomy
DOI		http://dx.doi.org/10.1051/0004-6361:20034289

A&A 418, 25-32 (2004)
DOI: 10.1051/0004-6361:20034289

Seyfert galaxies in UZC-Compact Groups

B. Kelm¹, P. Focardi¹ and V. Zitelli²

¹ Alma Mater Studiorum - Dipartimento di Astronomia, via Ranzani 1, 40127 Bologna, Italy
² INAF-Osservatorio Astronomico Bologna, via Ranzani 1, 40127 Bologna, Italy

(Received 8 September 2003 / Accepted 6 January 2004)

Abstract
We present results concerning the occurrence of Seyfert galaxies in a new automatically selected sample of nearby Compact Groups of galaxies (UZC-CGs). Seventeen Seyferts are found, constituting ~3% of the UZC-CG galaxy population. CGs hosting and non-hosting a Seyfert member exhibit no significant differences, except that a relevant number of Sy2 is found in unusual CGs, all presenting large velocity dispersion ( $\sigma>400$ km s ^-1), many neighbours and a high number of ellipticals. We also find that the fraction of Seyferts in CGs is 3 times as large as that among UZC-single-galaxies, and results from an excess of Sy2s. CG-Seyferts are not more likely than other CG galaxies to present major interaction patterns, nor to display a bar. Our results indirectly support the minor-merging fueling mechanism.

Key words: galaxies: clusters: general -- galaxies: Seyfert -- galaxies: interactions

Offprint request: B. Kelm, birgit.kelm@unibo.it

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