Based on observations obtained with the Hobby-Eberly Telescope, which is a joint project of the University of Texas at Austin, the Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen.

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Table A.1 is only available in electronic form at http://www.aanda.org

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...=0.0355

Throughout this paper, we assume H₀= 70 km s^-1 Mpc^-1.

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... spectrum

The fits were performed using a software originally written by Zuiderwijk and described in Véron et al. (1980).

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...2004)

Elvis et al. (1999) however have shown that the dispersion of the values of the Eddington ratio for a given BH mass is at least equal to a factor of 2.

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