Physics
Scientific paper
Mar 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007rmxac..27....1k&link_type=abstract
Triggering Relativistic Jets (Eds. William H. Lee & Enrico Ramírez-Ruiz) Revista Mexicana de Astronomía y Astrofísica (Serie de
Physics
2
Accretion, Accretion Disks, Black Hole Physics, Galaxies: Jets, Instabilities, Magnetohydrodynamics
Scientific paper
Recent results are reported from a program of large-scale numerical simulation of accretion and jet flows utilizing a code that computes 3-d MHD in full general relativity. We find that outflows arise as a direct consequence of accretion and have a generic geometric form: a funnel along the black hole rotation axis that has very low matter density but strong helical magnetic fields, surrounded by a funnel-wall flow of much greater matter density. Large-scale field is created spontaneously in the funnel as a consequence of accretion, despite the absence of large-scale field originally. Coronal pressure both accelerates and collimates the funnel-wall outflow. The strength of all quantities associated with the outflow is a strongly increasing function of black hole spin parameter a/M. Measured in terms of conventional rest-mass efficiency, both the matter and the electromagnetic components of the outflow can be comparable in power to the radiation expected from the accretion disk.
Hawley John F.
Hirose Susumu
Krolik Julian H.
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