Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...369..331v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 369, March 10, 1991, p. 331-363. Research supported by NSERC and Ministere
Astronomy and Astrophysics
Astrophysics
84
Galactic Nuclei, Galactic Structure, Seyfert Galaxies, Spectral Line Width, Emission Spectra, Markarian Galaxies, Signal To Noise Ratios
Scientific paper
An individual analysis is presented of the narrow-line profiles of 16 Seyfert galaxies. Substructure is observed in all but one of the sample objects. A direct relationship between the radio structure and these emission-line components is proposed in about half of the objects. The emission-line components generally have flux ratios which are quite similar to the rest of the narrow-line gas. These results suggest that the radio-emitting plasma strongly affects the kinematics of the thermal gas of the narrow-line region (NLR), but not its ionization state. Evidence for ionization/density stratification of the gas in the NLR is found in 4(ionization)/5(density) of the 11 objects for which a multispecies analysis is possible. The stronger cases of stratification are found in the objects whose emission lines present a minimum of profile substructure. A multicomponent model of the NLR is proposed to explain the results of this paper and previous ones.
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