Optical spectrophotometry of narrow-line radio galaxies

Details Optical spectrophotometry of narrow-line radio galaxies Optical spectrophotometry of narrow-line radio galaxies

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...243...81c&link_type=abstract

Astrophysical Journal, Part 1, vol. 243, Jan. 1, 1981, p. 81-88.

Other

87

Astronomical Photometry, Galactic Radiation, Line Spectra, Optical Emission Spectroscopy, Radio Galaxies, Seyfert Galaxies, Balmer Series, Emission Spectra, Galactic Nuclei, H Lines, Iron, Nitrogen, Oxygen

Scientific paper

Spectrophotometric measurements are presented of the emission lines in seven narrow-line radio galaxies. The resulting emission-line ratios, corrected for interstellar extinction on the basis of the H I Balmer-line ratios, are combined with previously published results for other narrow-line radio galaxies and Seyfert 2 spectra. Average spectra for comparison with theoretical models are listed for all the narrow-line radio galaxies, for all the Seyfert 2 galaxies, and for the high-ionization and low-ionization groups separately. Comparison with published results for Seyfert 2 galaxies confirms the general similarity of the relative strengths of the stronger emission lines in the two groups found by Koski (1978), except that small differences are found in the forbidden Ne III/forbidden O III and forbidden N II/forbidden O III ratios. Likewise, small but significant differences in the temperature in the O(2+) zone are found between the average narrow-line radio galaxy and the average Seyfert 2 galaxy. Suggestions are given for further theoretical modeling of these objects.

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