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Astron. Astrophys. 327, 72-80 (1997)

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The broad line region of narrow-line Seyfert 1 galaxies

Pedro M. Rodríguez-Pascual * 1, J. Miguel Mas-Hesse 2 and María Santos-Lleó 2

1 ESA - IUE Observatory, P.O. Box 50727, E-28080 Madrid, Spain
2 LAEFF-INTA, P.O. Box 50727, E-28080 Madrid, Spain

Received 19 March 1997 / Accepted 9 June 1997


We have analyzed new and archival IUE observations of narrow-line Seyfert 1 galaxies (NLS1) in order to revise the ultraviolet (UV) properties of this sub-group of Active Galactic Nuclei (AGN). We have found broad wings in the strongest UV emission lines, ruling out the hypothesis that there is no broad line emission region in this type of objects. Since the similarities in spectral energy distributions from the far-infrared (FIR) to the soft X rays in both narrow-line and broad-line Seyfert 1 galaxies do not suggest that the nuclei of NLS1 are hidden from a direct view, we discuss the possibility that the line emitting material in NLS1 is optically thin.

Key words: galaxies: Seyfert – galaxies: nuclei – ultraviolet: galaxies – X-rays: galaxies

* Affiliated to the Astrophysics Division, SSD, ESTEC

Send offprint requests to: Pedro M. Rodríguez-Pascual

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© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998