Physics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205...10b&link_type=abstract
Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at
Physics
5
Scientific paper
High resolution radio imaging and variability studies of active galactic nuclei have identified the prime mover as a massive, probably spinning black hole. In addition, indirect imaging, though X-ray spectroscopy is giving valuable information about the gas flow very close to the hole. Not surprisingly, much of the observed emission and the origin of bipolar outflows is being located ever closer to the hole. This implies that the primary manifestations of activity are controlled more by the accretion rate and the hole and less by the environment. In particular, it appears that the ratio of the jet power to the total bolometric luminosity has a very large range and this is an important signature of the manner in which gas accretes onto the hole. Recent work on adiabatic accretion and jet formation will be reviewed. It will be argued that when the accreting gas cannot radiate efficiently, most of the liberated energy is carried off in an outflow and that much of the observed emission is non-thermal. The propagation of radio waves propagating through magnetized plasma swirling around a Kerr hole will be discussed with reference to recent polarization observations of Sgr A*. Finally, some speculations concerning the role of AGN on galaxy formation will be entertained.
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