Stellar populations in Active Galactic Nuclei III ^*

¹ LUTH, UMR 8102 du CNRS, associé à l'Université Denis Diderot, Observatoire de Paris, Section de Meudon, 92195 Meudon Cedex, France e-mail: catherine.boisson@obspm.fr
² X-ray Astronomy Group, Department of Physics and Astronomy, University of Leicester, Leicester LEI 7RH, UK

Received: 4 February 2004
Accepted: 21 July 2004

Abstract

In this paper we apply the stellar population synthesis method previously described in Boisson et al. ([CITE]) to five more AGN.
The analysis of these new data strengthen our previous conclusions: i) homogeneity of the stellar population within a class of nuclear activity regardless of the morphological type of the host galaxy; ii) populations within the nuclear regions of LINERs and Seyfert 2s are different: LINERs have a very old metal-rich population while in the Seyfert 2s a contribution of a weak burst of star formation is observed together with the old high metallicity component; iii) in the circum-nuclar region (200 pc  kpc) of all the active galaxies in our sample, except for NGC 2992, we detect an old burst of star formation (0.2-1 Gyr),which is contrary to what is observed in normal galaxies. We note that the broad OIλ8446 Å emission line detected in the spectrum of the nucleus of NGC 2992 confirms its classification as a Seyfert 1.