The luminosity function of Seyfert galaxies and the cluster 3C 295

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Astronomical Photometry, Galactic Clusters, Seyfert Galaxies, Luminosity, Magnitude

Scientific paper

The apparently high percentage of Seyfert galaxies (three objects) found in the 3C 295 cluster by Dressler and Gunn (1982) is discussed. Among field galaxies, the fraction that are Seyfert galaxies is large at the very brightest absolute magnitudes, but drops abruptly by M(B) = -21. If the same is true in 3C 295 and other clusters of galaxies, the fraction of galaxies that are observed to be Seyferts depends critically upon the apparent magnitude limit to which high-quality spectra can be obtained. Thus, in the most distant clusters, where only the tip of the luminosity function can be observed, a relatively high fraction of the blue galaxies for which spectra are obtained would be expected to be Seyfert galaxies. Among relatively bright field galaxies, many Seyferts have been overlooked in previous spectral surveys, and the same may be true in clusters of galaxies. The spectral data must be published and discussed as functions of absolute magnitude.

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