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The emission-line spectrum of KUG 1031+398 and the Intermediate Line Region controversy

Anabela C. Gonçalves, Philippe Véron and Marie-Paule Véron

Centre National de la Recherche Scientifique
Observatoire de Haute-Provence
04870 St. Michel l'Observatoire, France

To appear in the proceedings of the Structure and Kinematics of Quasar Broad Line Regions conference held in Lincoln, Nebraska, on 23-26 March 1998. ASP Conf. Ser. (Eds. C.M.Gaskell et al.)


We present results based on the analysis of optical spectra of the Narrow-Line Seyfert 1 (NLS1) galaxy KUG 1031+398, for which evidence was reported of a line-emitting region ``intermediate'' (both in terms of velocity and density) between the conventional Broad and Narrow Line Regions (BLR and NLR, respectively). From our observations and modeling of the spectra, we get a consistent decomposition of the line profiles into four components: an extended HII region with unresolved lines, two distinct Seyfert-type clouds identified with the NLR, and a relatively narrow ``broad line'' component emitting only Balmer lines but no forbidden lines. Therefore, although we find this object to be exceptional in having line-emission from the BLR with almost the same width as the narrow lines, our interpretation of the data does not support the existence of an ``intermediate'' line region (ILR).

Galaxies: active - Galaxies: Seyfert - Galaxies: individual: KUG 1031+398