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2007ApJ...661..660K - Astrophys. J., 661, 660-671 (2007/June-1)

Anticorrelation between the mass of a supermassive black hole and the mass accretion rate in type 1 ultraluminous infrared galaxies and nearby QSOs.


Abstract (from CDS):

We discovered a significant anticorrelation between the mass of a supermassive black hole (SMBH), MBH, and the luminosity ratio of infrared to active galactic nuclei (AGN) Eddington luminosity, LIR/LEdd, over 4 orders of magnitude for ultraluminous infrared galaxies with type 1 Seyfert nuclei (type 1 ULIRGs) and nearby QSOs. This anticorrelation (MBHvs. LIR/LEdd) can be interpreted as the anticorrelation between the mass of a SMBH and the rate of mass accretion onto a SMBH normalized by the AGN Eddington rate, M{dot}BH/M{dot}Edd. In other words, the mass accretion rate M{dot}BH is not proportional to that of the central BH mass. Thus, this anticorrelation indicates that BH growth is determined by the external mass supply process, and not the AGN Eddington-limited mechanism. Moreover, we found an interesting tendency for type 1 ULIRGs to favor a super-Eddington accretion flow, whereas QSOs tended to show a sub-Eddington flow. On the basis of our findings, we suggest that a central SMBH grows by changing its mass accretion rate from super-Eddington to sub-Eddington. According to a coevolution scenario of ULIRGs and QSOs based on the radiation drag process, it has been predicted that a self-gravitating massive torus, whose mass is larger than a central BH, exists in the early phase of BH growth (type 1 ULIRG phase) but not in the final phase of BH growth (QSO phase). At the same time, if one considers the mass accretion rate onto a central SMBH via a turbulent viscosity, the anticorrelation (MBH vs. LIR/LEdd) is well explained by the positive correlation between the mass accretion rate M{dot}BH and the mass ratio of a massive torus to a SMBH.

Abstract Copyright:

Journal keyword(s): Black Hole Physics - Galaxies: Active - Galaxies: Bulges - Galaxies: Formation - Galaxies: Starburst - Infrared: Galaxies - Galaxies: Quasars: General

Simbad objects: 70

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