Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-09-07
Astronomy and Astrophysics
Astrophysics
2 pages, 1 figure. Contribution to the proceedings of the conference "Growing Black Holes", Garching, Germany, June 21-24, 200
Scientific paper
10.1007/11403913_76
We use medium resolution optical spectra of 3CR radio galaxies to estimate their black hole masses and accretion rates. Black hole masses are found from central stellar velocity dispersions and accretion rates are derived from narrow emission-line luminosities. The sample covers both Fanaroff-Riley (FR) classes; the more powerful FRIIs and the less powerful FRIs. We find that FRIs and FRIIs separate in diagrams of black hole mass versus radio luminosity and narrow-line luminosity. This suggests that, at a given black hole mass, the FRIIs accrete more efficiently, or accrete more matter, than FRIs.
Armus Lee
Lacy Mark
Wold Magrethe
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