Recent Results on Active Galactic Nuclei |
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Authors: | R D Blandford |
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Institution: | (1) Theoretical Astrophysics, 130-33 Caltech, Pasadena, CA 91125, USA |
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Abstract: | There is now little doubt that the nuclei of most galaxies contain massive black holes with 106M⊙< M < 1010M⊙and that these are ultimately responsible for most nuclear activity when they are supplied with gas. Parallel observations
of Galactic X-ray sources are providing small scale counterparts that have similar properties except that they vary far more
rapidly. As we can now determine the masses of these black holes in several instances, we can ask much more quantitative questions
about the mode of accretion and the origin and collimation of outflows. In this contribution, I will emphasize the importance
of magnetic field for extracting the angular momentum from the flow and explain how the radiative efficiency is controlled
by the mass accretion rate and the actual properties of magnetized, plasma.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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