Energy dissipation and angular momentum transfer within a magnetically torqued accretion disc

Details Energy dissipation and angular momentum transfer within a magnetically torqued accretion disc Energy dissipation and angular momentum transfer within a magnetically torqued accretion disc

2009-06-23

arxiv.org/abs/0906.4241v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages with 3 figures, accepted by Science in China Series G

Scientific paper

We discuss transportation and redistribution of energy and angular momentum in the magnetic connection (MC) process and Blandford-Payne (BP) process. The MC results in readjusting the interior viscous torque, and its effects are operative not only in but also beyond the MC region. The BP process is invoked to transfer the "excessive" angular momentum from an accretion disc. In addition, we derive a criterion for the interior viscous torque to resolve the puzzle of the overall equilibrium of angular momentum in disc accretion. It turns out that the BP efficiency of extracting angular momentum and the intensity of the outflow are required to be greater than some critical values.

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