The 12 micron galaxy sample. I - Luminosity functions and a new complete active galaxy sample

Astronomy and Astrophysics – Astronomy

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Active Galactic Nuclei, Infrared Sources (Astronomy), Seyfert Galaxies, Astronomical Catalogs, Color-Color Diagram, Far Infrared Radiation, Infrared Astronomy Satellite, Luminosity, Red Shift

Scientific paper

An all-sky 12 micron flux-limited sample of active galaxies was selected from the IRAS Point Source Catalog. Most of the sample galaxies are in existing catalogs, and 99 percent have measured redshifts. The 12-micron and the far-infrared luminosity functions of active and normal galaxies are derived using IRAS co-added data. A total of 22 percent of the sample galaxies harbor active nuclei. The sample consists almost equally of Seyfert 1, Seyfert 2, and LINER nuclei. The derived luminosity fuctions for Seyfert 1 and Seyfert 2 galaxies are indistinguishable from those of the optically selected CfA sample. Thus, 12 micron selection is the most efficient available technique for finding complete active galaxy samples.

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