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Possible Evidence for Truncated Thin Disks in the Low-Luminosity Active Galactic Nuclei M81 and NGC 4579
Open accessAbstract
M81 and NGC 4579 are two of the few low-luminosity active galactic nuclei that have an estimated mass for the central black hole, detected hard X-ray emission, and detected optical/UV emission. In contrast to the canonical "big blue bump," both have optical/UV spectra that decrease with increasing frequency in a nuLnu plot. Barring significant reddening by dust and/or large errors in the black hole mass estimates, the optical/UV spectra of these systems require that the inner edge of a geometrically thin, optically thick accretion disk lies at approximately 100 Schwarzschild radii. The observed X-ray radiation can be explained by an optically thin, two-temperature, advection-dominated accretion flow at smaller radii.
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Citations
Cited by
Hot Accretion Flows Around Black Holes
Yuan, F., & Narayan, R. (2014) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-082812-141003 · Cited by 1,529
Self-citationAdvection-dominated accretion and the black hole event horizon
Narayan, R., & McClintock, J. E. (2008) · New Astronomy Reviews · doi:10.1016/j.newar.2008.03.002 · Cited by 451
Self-citationOn the Relationship between Radio Emission and Black Hole Mass in Galactic Nuclei
Ho, L. C. (2002) · The Astrophysical Journal · doi:10.1086/324399 · Cited by 346
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Metadata
- Authors
- Quataert, E., Di Matteo, T., Narayan, R., & Ho, L. C.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1999-11-10
- Volume
- 525
- Issue
- 2
- Pages
- L89-L92
- ISSN
- 0004-637X (ISSN-L)
- OpenAlex
- W2034751728
- Cited by
- 164
- References
- 0
- FWCI
- 9.38
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Quataert, E., Di Matteo, T., Narayan, R., & Ho, L. C. (1999). Possible Evidence for Truncated Thin Disks in the Low-Luminosity Active Galactic Nuclei M81 and NGC 4579. The Astrophysical Journal. https://doi.org/10.1086/312353
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