NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-16 T10:19:28 PST
Help | Comment | NED Home

For refcode 1993ApJ...414..552O:
Retrieve 53 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1993ApJ...414..552O SPECTROSCOPIC STUDY OF THE CfA SAMPLE OF SEYFERT GALAXIES DONALD E. OSTERBROCK AND ANDRE MARTEL University of California Observatories, Board of Studies in Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 Received 1992 October 9; accepted 1993 March 18 ABSTRACT High signal-to-noise ratio spectra were obtained of nearly all the Seyfert 2 galaxies in the CfA complete sample published by Huchra & Burg, and of some of the Seyfert 1's as well. Several of the Seyfert 2 galaxies have weak, broad components to their H{alpha} emission lines, and in some cases to H{beta} as well, and thus are Seyfert 1.8 or 1.9 objects on the Lick Observatory classfication system. Luminosity functions and mean absolute magnitudes were calculated separately for each type and for various groupings of the types. Our spectra confirm Huchra & 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 the 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 signal-to-noise ratio spectra confirm that, as suspected earlier, many Seyfert 1.8, 1.9, and 2 galaxies have weak [Fe x]{lambda}6735 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. Subject headings: galaxies: Seyfert - surveys
Retrieve 53 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home