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Date and Time of the Query: 2019-08-18 T02:44:25 PDT
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For refcode 2002ApJ...565..762W:
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2002ApJ...565..762W Black Holes of Active and Quiescent Galaxies. I. The Black Hole-Bulge Relation Revisited Amri Wandel Racah Institute of Physics, The Hebrew University, Jerusalem 91405, Israel; amri@vms.huji.ac.il Received 2001 July 11; accepted 2001 October 18 ABSTRACT Massive black holes detected in the centers of many nearby galaxies show an approximately linear relation with the luminosity of the host bulge, implying that the black hole (BH) mass is 0.001-0.002 of the bulge. Previous work suggested that the black holes of active (Seyfert 1) galaxies have a similar relation, but apparently with a significantly lower value of M_BH_/M_bulge_ (Wandel). New data show that this difference was mainly due to overestimated BH masses in quiescent galaxies and bulge magnitudes in Seyfert galaxies. Using new and updated data we show that active galactic nuclei (AGNs) have the same BH-bulge relation as ordinary (inactive) galaxies. We derive the BH-bulge relation for a sample of 55 AGNs (Seyfert 1 galaxies+quasars) and 35 quiescent galaxies, finding that broad-line AGNs have an average BH/bulge mass fraction of ~0.0015 with a strong correlation (M_BH_ is proportional to L_bulge_^0.9+/-0.16^). This BH-bulge relation is consistent with the BH-bulge relation of quiescent galaxies and much tighter than previous results. Narrow-line AGNs appear to have a lower ratio, M_BH_/M_bulge_ ~ 10^-4^ to 10^-3^. We examine various explanations for this lower ratio. We find that the BH/bulge ratio in AGNs is inversely correlated with the emission-line width, implying a strong linear relation between the size of the broad emission-line region and the host bulge luminosity. Finally, combining AGNs with observed and estimated stellar velocity dispersion, we find a significant correlation (M_BH_ is proportional to {sigma}^3.5-5^), consistent with that of quiescent galaxies. Subject headings: black hole physics - galaxies: active - galaxies: bulges - galaxies: nuclei - galaxies: Seyfert - quasars: general
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