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Title:
The spatial distribution of active galactic nuclei. I - The density of Seyfert galaxies and liners
Authors:
Huchra, John; Burg, Richard
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Johns Hopkins University; Space Telescope Science Institute, Baltimore, MD)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. 90-97. (ApJ Homepage)
Publication Date:
07/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Active Galactic Nuclei, Red Shift, Seyfert Galaxies, Sky Surveys (Astronomy), Space Density, Astronomical Catalogs, Astronomical Spectroscopy, Stellar Luminosity
DOI:
10.1086/171488
Bibliographic Code:
1992ApJ...393...90H

Abstract

A sample of 26 Seyfert 1 and 23 Seyfert 2 galaxies, 33 low-ionization nuclear emission regions (LINERs), one QSO and three other objects from the CfA Redshift Survey is used to calculate the spatial density of bright active galactic nuclei (AGNs). Classical Seyfert galaxies comprise 1.3 percent of all galaxies at integrated absolute magnitude -20.0, which agrees with previous estimates based on more incomplete samples. The fraction of galaxies that are AGNs rises steeply with absolute magnitude. Three of the five galaxies in the CfA survey more luminous than M(B) = -21.5 are AGNs; the two most luminous galaxies in the CfA survey are both Seyfert 1 galaxies. The integrated space density of Seyfert 2 galaxies is found to be approximately twice as large as the space density of Seyfert 1 galaxies. Measurement of the spatial density of LINERs and other types of AGNs is subject to severe optical selection effects.

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