Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..351t&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 15, 1992, p. 351-368.
Astronomy and Astrophysics
Astronomy
87
Astronomical Spectroscopy, Bow Waves, Radio Emission, Seyfert Galaxies, Shock Waves, Emission Spectra, Galactic Nuclei, Line Spectra, Nonthermal Radiation
Scientific paper
A model for the narrow-line region (NLR) in which the linear motions of the radio components in Seyfert galaxies drive bowshocks into the ambient nuclear medium is described. The cooled shocked gas, photoionized by the UV nuclear continuum, produces the optical NLR emission. Forbidden O III 5007 luminosities of around 10 exp 39 - 10 exp 42 erg/s are calculated from the model, which is in good agreement with the observed NLR forbidden O III 5007 luminosity range. The emission lines produced by the model have widths of up to 500 km/s and may have large asymmetries. The model can explain the wide diversity of observed NLR line profile shapes, the predominance of profiles with excess emission in the blue wind, and the association between the radio and optical structures, including displacements between the centers of radio and optical emission.
Axon David J.
Dyson John E.
Taylor David
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