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• W2061451565 abstract "We estimate the radiative efficiency (epsilon) of individual type 1 SDSS QSOs by using their bolometric luminosities (L_{bol}) and accretion rates (dot{M}_{bullet,acc}), which may be related to the assembly histories and spins of the central massive black holes (MBHs). We estimate L_{bol} by using the empirical spectral energy distributions of QSOs and dot{M}_{bullet,acc} by fitting the observed optical luminosity(/-ies) with the thin accretion disk model, assuming the MBH masses given by the virial mass estimator(s) (M_{bullet,vir}). We find an apparent correlation between epsilon and M_{bullet,vir}, which is strong at redshift z la 1.8, weak at z ga 2, and consistent with that found by Davis & Laor (2011) for 80 PG QSOs at z leq 0.5. To investigate whether this correlation is intrinsic or not, we construct a mock sample of QSOs according to the true MBH mass and Eddington ratio distributions given in Kelly & Shen (2013). By comparing the results obtained from the mock sample with that from the SDSS sample, we demonstrate that the apparent epsilon-M_{bullet,vir} correlation can be produced by and mainly due to the selection effects of the SDSS sample and the bias induced by the usage of M_{bullet,vir} as the true MBH mass. The mean values of epsilon of those SDSS QSOs are consistent with being a constant simeq 0.11-0.16 over the redshift range of 0.3 la z la 4. We conclude that the current SDSS QSO data is consistent with no strong intrinsic correlation between radiative efficiency and true MBH mass and no significant redshift evolution of radiative efficiencies." @default.
• W2061451565 created "2016-06-24" @default.
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• W2061451565 date "2013-10-22" @default.
• W2061451565 modified "2023-10-16" @default.
• W2061451565 title "Radiative efficiency of disc accretion in individual SDSS QSOs" @default.
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• W2061451565 doi "https://doi.org/10.1093/mnras/stt1811" @default.
• W2061451565 hasPublicationYear "2013" @default.
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