Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...428..373b&link_type=abstract
Astronomy and Astrophysics, v.428, p.373-382 (2004)
Astronomy and Astrophysics
Astrophysics
9
Galaxies: Stellar Content, Galaxies: Active
Scientific paper
In this paper we apply the stellar population synthesis method previously described in Boisson et al. (\cite{Boisson2000}) 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 ≤D≤1 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.
Based on observations collected at the New Technology Telescope of the European Southern Observatory, La Silla, Chile.
Boisson Catherine
Joly Monique
Pelat Didier
Ward Martin J.
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