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Broad emission line profiles in Seyfert-1 galaxies: [O III]-wings from a transition zone
1989 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 211, no 2, 293-309309 p.Article in journal (Refereed) Published
Abstract [en]

The authors demonstrate that broad wings are present under the strong [O III] lambda 5007 line in 10 out of 12 observed Seyfert-1 galaxies. The question is addressed whether the wing is due to broad [O III] emission or to some other ion. The alternatives considered are Fe II (42) lambda 5018, He I lambda 5016 and Si II lambdalambda 5041, 5056 or even Hbeta. The authors have searched for a counterpart of the wing in other forbidden and permitted lines. The observations yield a crude estimate of the density in the wing-emitting region. The authors derive a lower limit to the region's size. Because the [O III] emitting gas holds an intermediate position between the broad line region (BRL) and the narrow line region (NLR), both in density and distance, the authors denominate it the transition line region (TLR). They surmise that the outflowing part of the BLR provides the material of the TLR, before slowing down to NLR velocities

Place, publisher, year, edition, pages
1989. Vol. 211, no 2, 293-309309 p.
Keyword [en]
Experimental/ astronomical spectra, interstellar matter, oxygen, Seyfert galaxies, visible astronomical observations/ interstellar matter, visible, AD 1982 09 to 10, forbidden line, emission line profiles, Seyfert-1 galaxies, transition zone, broad wings, Fe II, He I, Si II, Hbeta, permitted lines, density, wing-emitting region, size, broad line region, narrow line region, transition line region, velocities, 351 to 754 nm/ A9850R Active and peculiar galaxies A9850E Galactic structure, content and morphology A9580J Photographic region astronomical observations A9840B Interstellar matter/ wavelength 3.51E-07 to 7.54E-07 m
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-197180ISI: 3381358OAI: oai:DiVA.org:uu-197180DiVA: diva2:611964
Available from: 2013-03-19 Created: 2013-03-18 Last updated: 2013-03-19

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