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Date and Time of the Query: 2019-03-22 T03:14:11 PDT
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For refcode 2013ApJ...764..151G:
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2013ApJ...764..151G The M_BH_-L_spheroid_ Relation at High and Low Masses, the Quadratic Growth of Black Holes, and Intermediate-mass Black Hole Candidates Graham, Alister W.; Scott, Nicholas Abstract. From a sample of 72 galaxies with reliable supermassive black hole masses M_bh_, we derive the M_bh_-(host spheroid luminosity, L) relation for (1) the subsample of 24 core-Sersic galaxies with partially depleted cores, and (2) the remaining subsample of 48 Sersic galaxies. Using K_s_ -band Two Micron All Sky Survey data, we find the near-linear relation M_bh_vpropL ^1.10 +/- 0.20^_K_s__ for the core-Sersic spheroids thought to be built in additive dry merger events, while we find the relation M_bh_vpropL ^2.73 +/- 0.55^_K_s__ for the Sersic spheroids built from gas-rich processes. After converting literature B-band disk galaxy magnitudes into inclination- and dust-corrected bulge magnitudes, via a useful new equation presented herein, we obtain a similar result. Unlike with the M_bh_-(velocity dispersion) diagram, which is also updated here using the same galaxy sample, it remains unknown whether barred and non-barred Sersic galaxies are offset from each other in the M_bh_-L diagram. While black hole feedback has typically been invoked to explain what was previously thought to be a nearly constant M_bh_/M_Spheroid_ mass ratio of ~0.2%, we advocate that the near-linear M_bh_-L and M_bh_-M_Spheroid_ relations observed at high masses may have instead arisen largely from the additive dry merging of galaxies. We argue that feedback results in a dramatically different scaling relation, such that black hole mass scales roughly quadratically with the spheroid mass in Sersic galaxies. We therefore introduce a revised cold-gas "quasar" mode feeding equation for semi-analytical models to reflect what we dub the quadratic growth of black holes in Sersic galaxies built amidst gas-rich processes. Finally, we use our new Sersic M_bh_-L equations to predict the masses of candidate intermediate mass black holes in almost 50 low-luminosity spheroids containing active galactic nuclei, finding many masses between that of stellar mass black holes and supermassive black holes. Key words: black hole physics, galaxies: evolution, galaxies: nuclei
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