Possible Evidence for Truncated Thin Disks in the Low-Luminosity Active Galactic Nuclei M81 and NGC 4579
Di Matteo, Tiziana
Ho, Luis C.
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CitationQuataert, Eliot, Tiziana Di Matteo, Ramesh Narayan, and Luis C. Ho. 1999. “Possible Evidence for Truncated Thin Disks in the Low-Luminosity Active Galactic Nuclei M81 and NGC 4579.” The Astrophysical Journal 525 (2): L89–92. https://doi.org/10.1086/312353.
AbstractM81 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 vL(v) 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 similar to 100 Schwarzschild radii. The observed X-ray radiation can be explained by an optically thin, two-temperature, advection-dominated accretion flow at smaller radii.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41384919
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