Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...249..462o&link_type=abstract
Astrophysical Journal, Part 1, vol. 249, Oct. 15, 1981, p. 462-470.
Astronomy and Astrophysics
Astrophysics
152
Emission Spectra, H Alpha Line, H Beta Line, Seyfert Galaxies, Spectrophotometry, Astronomical Photometry, Forbidden Bands, Ionization, Radio Galaxies, Spectrum Analysis, Tables (Data)
Scientific paper
Spectrophotometric measurements show five galaxies with strong narrow emission lines combined with weak, broad H-alpha and H-beta components to have line and continuum spectral properties intermediate between those of Seyfert 1 and Seyfert 2 galaxies. Because they are closer to the latter, they are called Seyfert 1.8 and Seyfert 1.9, depending on the presence of broad H-beta emissions in the scans. The observed intensity ratios of the broad H-alpha/H-beta emission lines are large compared with those of typical Seyfert 1 galaxies, suggesting the importance of dust in the broad-line regions. Narrow-line spectra of the Seyfert 1.8 and 1.9 are found to have low ionization, implying that their narrow-line region is reached by few high-energy photons. Emphasis is placed on the correlation between a strong, featureless continuum and broad H I emission lines in Seyfert and radio galaxies.
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