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Spectroscopic study of the CfA sample of Seyfert galaxies
Osterbrock, Donald E.; Martel, Andre
AA(California Univ., Santa Cruz), AB(California Univ., Santa Cruz)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 552-562. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Active Galactic Nuclei, Astronomical Spectroscopy, Emission Spectra, Extragalactic Radio Sources, Galactic Structure, Seyfert Galaxies, Classifying, H Alpha Line, H Beta Line, H I Regions, Luminosity, Spectrophotometry
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High SNR spectra were obtained of nearly all the Seyfert 2 galaxies in the CfA complete sample published by Huchra and Burg (1992) and of some of the Seyfert 1's as well. Luminosity functions and mean absolute magnitudes were calculated separately for each type and for various groupings of the types. Our spectra confirm Huchra and Burg's conclusion that the CfA sample contains a higher fraction of Seyfert 1's than the Wasilewski sample, which therefore appears to be deficient in faint reddened Seyfert 1 galaxies. Specific geometrical models and evolutionary pictures of AGNs are discussed. All Seyfert 1.8, 1.9, and 2 galaxy spectra were measured spectrophotometrically, and all, when plotted in diagnostic diagrams, lie in the AGN regions except for two objects barely outside the region on one diagram. These good SNR spectra confirm that, as suspected earlier, many Seyfert 1.8, 1.9, and 2 galaxies have weak forbidden Fe X 6735 A emission in their spectra. The broad components of the Seyfert 1.8 and 1.9 galaxies have large H-alpha/H-beta intensity ratios, extending previous similar results.

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