The spatial distribution of active galactic nuclei. I - The density of Seyfert galaxies and liners

Details The spatial distribution of active galactic nuclei. I - The density of Seyfert galaxies and liners The spatial distribution of active galactic nuclei. I - The density of Seyfert galaxies and liners

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...393...90h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 393, no. 1, July 1, 1992, p. 90-97.

Astronomy and Astrophysics

Astronomy

248

Active Galactic Nuclei, Red Shift, Seyfert Galaxies, Sky Surveys (Astronomy), Space Density, Astronomical Catalogs, Astronomical Spectroscopy, Stellar Luminosity

Scientific paper

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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