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New virial black-hole mass estimates are presented for a sample of 72 AGNcovering three decades in optical luminosity. Using a model in which the AGNbroad-line region (BLR) has a flattened geometry, we investigate theM_{bh)-L_{bulge} relation for a combined 90-object sample, consisting of theAGN plus a sample of 18 nearby inactive elliptical galaxies with dynamicalblack-hole mass measurements. It is found that, for all reasonablemass-to-light ratios, the M_{bh}-L_{bulge} relation is equivalent to a linearscaling between bulge and black-hole mass. The best-fitting normalization ofthe M_{bh}-M_{bulge} relation is found to be M_{bh}=0.0012M_{bulge}, inagreement with recent black-hole mass studies based on stellar velocitydispersions. Furthermore, the scatter around the M_{bh}-L_{bulge} relation forthe full sample is found to be significantly smaller than has been previouslyreported (\Delta \log M_{bh}=0.39 dex). Finally, using the nearby inactiveelliptical galaxy sample alone, it is shown that the scatter in theM_{bh}-L_{bulge} relation is only 0.33 dex, comparable to that of theM_{bh}-sigma relation. These results indicate that reliable black-hole massestimates can be obtained for high redshift galaxies.Comment: 6 pages, 3 figures, to appear in proceedings for the ESO workshop  "The mass of galaxies at low and high redshift", Venice, Oct 24-26, 200

On the Black Hole - Bulge Mass Relation in Active and Inactive Galaxies