Spectrophotometry of Seyfert 2 galaxies and narrow-line radio galaxies

Details Spectrophotometry of Seyfert 2 galaxies and narrow-line radio galaxies Spectrophotometry of Seyfert 2 galaxies and narrow-line radio galaxies

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223...56k&link_type=abstract

Astrophysical Journal, Part 1, vol. 223, July 1, 1978, p. 56-73.

Astronomy and Astrophysics

Astrophysics

547

Astronomical Photometry, Galactic Radiation, Radio Galaxies, Seyfert Galaxies, Astronomical Catalogs, Continuous Spectra, Emission Spectra, Forbidden Bands, Photoionization, Red Shift, Spectral Line Width

Scientific paper

Results are reported for a spectrophotometric survey of several Seyfert 2 galaxies, intermediate Seyferts, and narrow-line radio galaxies. The emission-line spectra of the galaxies are analyzed, emphasizing line intensities, reddening, temperatures, densities, line strength correlations, line widths, and redshift differences. The continuous spectra are examined, and possible ionization sources are considered. It is found that: (1) there are no distinguishing differences between the spectra of Seyfert 2 galaxies and narrow-line radio galaxies; (2) the emission spectra are rich in lines from a wide range of ionization levels; (3) the continuum is starlight diluted by an underlying continuous spectrum; (4) the line widths of both classes of galaxies have the same distribution; (5) there appear to be regions of high and low ionization in the Seyfert 2 and narrow-line radio galaxies; (6) photoionization seems quite likely as the energy input to the gas; and (7) all the galaxies show a UV excess in their spectra.

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