Broad emission line profiles in Seyfert-1 galaxies: [O III]-wings from a transition zone

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Broad emission line profiles in Seyfert-1 galaxies : [O III]-wings from a transition zone

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

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
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

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