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Date and Time of the Query: 2019-06-20 T02:27:14 PDT
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For refcode 2001ApJ...553..677L:
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2001ApJ...553..677L On the Linearity of the Black Hole-Bulge Mass Relation in Active and in Nearby Galaxies Ari Laor Physics Department, Technion, Haifa 32000, Israel; laor@physics.technion.ac.il Received 2001 January 31; accepted 2001 February 1 ABSTRACT Analysis of (Palomar-Green) PG quasar observations suggests a nonlinear relation between the black hole mass, M_BH_, and the bulge mass, M_bulge_, although a linear relation, as proposed for nearby galaxies, cannot be ruled out. New M_BH_ values for nearby galaxies from K. Gebhardt et al., and L_bulge_ measurements for Seyfert 1 galaxies from S. N. Virani et al., are used here to obtain a more accurate value for the slope of the M_BH_- M_bulge_ relation. The combined sample of 40 active and nonactive galaxies suggests a significantly nonlinear relation, M_BH_ is proportional to M_bulge_^1.53+/-0.14. Further support for a nonlinear relation is provided by the slope of the M_BH_-stellar velocity dispersion relation found recently, and by the low M_BH_ found in late-type spiral galaxies. The mean M_BH_/M_bulge_ ratio is therefore not a universal constant, but rather drops from ~0.5% in bright (M_V_ ~ -22) ellipticals to ~0.05% in low- luminosity (M_V_ ~ -18) bulges. Hubble Space Telescope determinations of M_BH_ in late-type spirals, and of the bulge magnitude in narrow-line Seyfert 1 galaxies (both predicted to have low M_BH_), can further test the validity of the nonlinear M_BH_-M_bulge_ relation. Subject headings: galaxies: nuclei-quasars: general
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