The DOI matches its Crossref record; 75 of the 75 references it cites were found in a registry or an index.
THE RADIATIVE EFFICIENCY OF ACCRETION FLOWS IN INDIVIDUAL ACTIVE GALACTIC NUCLEI
Open accessAbstract
The radiative efficiency of active galactic nucleus (AGN) is commonly estimated based on the total mass accreted and the total AGN light emitted per unit volume in the universe integrated over time (the Soltan argument). In individual AGNs, thin accretion disk model spectral fits can be used to deduce the absolute accretion rate , if the black hole mass M is known. The radiative efficiency η is then set by the ratio of the bolometric luminosity L bol to . We apply this method to determine η in a sample of 80 Palomar–Green quasars with well-determined L bol , where is set by thin accretion disk model fits to the optical luminosity density, and the M determination based on the bulge stellar velocity dispersion (13 objects) or the broad line region. We derive a mean log η = −1.05 ± 0.52 consistent with the Soltan-argument-based estimates. We find a strong correlation of η with M , rising from η ∼ 0.03 at M = 10 7 M ☉ and L / L Edd ∼ 1 to η ∼ 0.4 at M = 10 9 M ☉ and L / L Edd ∼ 0.3. This trend is related to the overall uniformity of L opt / L bol in our sample, particularly the lack of the expected increase in L opt / L bol with increasing M (and decreasing L / L Edd ), which is a generic property of thermal disk emission at fixed η. The significant uncertainty in the M determination is not large enough to remove the correlation. The rising η with M may imply a rise in the black hole spin with M , as proposed based on other indirect arguments.
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Cites
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Cosmological simulations of black hole growth: AGN luminosities and downsizing
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SEMI-ANALYTIC GALAXY EVOLUTION (SAGE): MODEL CALIBRATION AND BASIC RESULTS
Croton, D. J., Stevens, A. R. H., Tonini, C., Garel, T., Bernyk, M., Bibiano, A., Hodkinson, L., Mutch, S. J., Poole, G. B., & Shattow, G. M. (2016) · The Astrophysical Journal Supplement Series · doi:10.3847/0067-0049/222/2/22 · Cited by 264
Giustini, M., & Proga, D. (2019) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201833810 · Cited by 166
Piotrowska, J. M., Bluck, A. F. L., Maiolino, R., & Peng, Y. (2022) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stab3673 · Cited by 156
Metadata
- Authors
- Davis, S. W., & Laor, A.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2011-01-25
- Volume
- 728
- Issue
- 2
- Pages
- 98
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1782044501
- Cited by
- 322
- References
- 75
- FWCI
- 11.75
- Type
- journal article
- Language
- en
- Open access
- bronze
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