The optical luminosity function of Seyfert 1 nuclei

Astronomy and Astrophysics – Astronomy

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Galactic Nuclei, Galactic Radiation, Luminosity, Seyfert Galaxies, Active Galactic Nuclei, Astronomical Photometry, Correction, Error Analysis

Scientific paper

All confirmed Seyfert 1 and 1.5 galaxies in the area covered by the first nine Markarian lists have been collected and their nuclear magnitudes have been estimated. Sandage's (1973) method for separating the nuclear and host galaxy contributions to observed magnitudes is applied, and the results are compared with those obtained by subtracting out the contribution of an appropriate template galaxy. The procedure for deriving the luminosity function is described, including the definition of a 'homogeneous' subsample and corrections for incompleteness, random errors in the nuclear magnitudes, and the effect of binning. The resulting luminosity function matches well with that of optically selected QSOs at M(B) of about -23 (H0) = 50), flattens out somewhat at M(B) of about -21.5, but does not show clear evidence of a levelling off down to M(B) of about -18. It also compares favorably with the local luminosity function of X-ray-selected active galactic nuclei.

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