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Puzzle of Angular Momentum Transfer in Black Hole Accretion Disc
GAN Zhaoming 1,YE Yongchun 2,WANG Dingxiong 2 * #
1.Shanghai Astronomical Observatory
2.School of Physics, Huazhong University of Science and Technology
*Correspondence author
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Funding: none
Opened online:28 January 2012
Accepted by: none
Citation: GAN Zhaoming,YE Yongchun,WANG Dingxiong.Puzzle of Angular Momentum Transfer in Black Hole Accretion Disc[OL]. [28 January 2012] http://en.paper.edu.cn/en_releasepaper/content/4462496
 
 
Angular momentum transfer is of fundamental importance in the theory of accretion disc. Accreting matter lose its angular momentum to move inward a smaller radius, and eventually falls onto the central object. In the classical theory of accretion disc, interior viscous process is invoked to transfer angular momentum from smaller radii to larger ones. It is noted that the angular momentum accumulated in the outer disc will block the disc accretion, since the interior viscous torque increases with the disc radius. We propose that this puzzle can be resolved by invoking the Blandford-Payne (BP) process, in which part of accreting matter is launched centrifugally along magnetic field lines anchored in the disc, and angular momentum can be extracted continuously from the disc with the outflow. A criterion related to overall equilibrium of angular momentum in accretion disc is derived.
Keywords:black hole astrophysics; accretion disc; angular momentum transfer
 
 
 

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