HEAD 2000, November 2000
Session 4. Seyfert Galaxies
Display, Monday, November 6, 2000, 8:00am-6:00pm, Bora Bora Ballroom

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[4.12] The Eddington Ratio of Seyfert Galaxies

E. Agol (Caltech)

Using the correlation between black hole mass and velocity dispersion of the host galaxy bulge in nearby galaxies, we estimate the masses of a dozen or so Seyfert galaxies. Due to uncertainties in the velocity dispersion measurements, the inferred masses are typically accurate to only ~ 0.5 dex. We compute the Eddington ratio, L/LEdd, assuming the emission is isotropic. We find that the Eddington ratio is between L/LEdd ~10-3-0.3 for Seyferts. Two narrow-line Seyfert 1s have L/LEdd ~ 10-2, not L ~LEdd as is frequently claimed in the literature. The radio galaxy 3C 120 appears to be super-Eddington at one epoch, indicating that it may be beamed.

This work was supported by NSF grant 96-19622 and a Chandra fellowship.

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The author(s) of this abstract have provided an email address for comments about the abstract: agol@pha.jhu.edu

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