1998A&A...334..124R

This paper is the second of a series (Radovich and Rafanelli, 1996A&A...306...97R) devoted to the investigation of the emission line properties of the circumnuclear and extranuclear regions in a sample of nearby Seyfert galaxies. Our aim is to identify star formation regions around the active nucleus and to derive their properties like star formation rate and dust content, and compare them with those observed in non-active galaxies. We show that photoionization models may fit the observed line ratios both in the nuclear and circumnuclear regions of the Sy 1.2 galaxy NGC 7214. In the nucleus, components with different densities must be considered. In the circumnuclear regions, line ratios to projected distances of ∼2kpc from the nucleus are typical of ionization by a power law. At higher distances (∼5-8kpc) they are fitted either by a thermal continuum or assuming that both stars and the non thermal source contribute to the ionization of the gas. A simple interpretation is suggested, in the framework of the unified model for Seyfert galaxies. Evidence for enhanced star formation, maybe related to the ongoing interaction with a close spiral galaxy, is found in only one region.