Emission-line ratios in a radio-selected sample of active galactic nuclei.

Details Emission-line ratios in a radio-selected sample of active galactic nuclei. Emission-line ratios in a radio-selected sample of active galactic nuclei.

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281..509s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. Vol. 281, No. 2, p. 509 - 521

Astronomy and Astrophysics

Astronomy

41

Galaxies: Active -- Quasars: Emission Lines -- Radio Continuum: Galaxies, Active Galactic Nuclei: Spectra, Active Galactic Nuclei: Emission Lines, Active Galactic Nuclei: Line Ratios, Active Galactic Nuclei: Photoionization, Active Galactic Nuclei: Shock Waves

Scientific paper

The authors present spectra and emission-line fluxes or ratios for a nearly complete sample of radio-flux-selected active galaxies with z < 0.11. The spectra extend to 1 μm and include the [S III] λ9069 line which is believed to be able to discriminate between shocks and photoionization. The authors compare their data with the predictions of photoionization and shock-excitation models and conclude that, whilst photoionization is slightly preferred as the excitation mechanism in the narrow-line regions of such objects, the strength of the [O III] λ4363 auroral line is too strong to be explained by simple single-phase models.

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