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EVOLUTION OF ANGULAR VELOCITY OF CENTRAL BLACK HOLES OF ACCRETION DISKS

WANG DING-XIONG

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EVOLUTION OF ANGULAR VELOCITY OF CENTRAL BLACK HOLES OF ACCRETION DISKS

WANG DING-XIONG
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  • The evolution characters of angular velocity Ωh of central black holes of accretion disks (including thin and thick disks) are investigated by considering both accretion and the Blandford-Znajek (BZ) process. It is shown that the rate of change of Ωh with respect to time truns from the positive value to the negative, as the dimensionless angular momentum a* evolves to a critical value. Evolving in a non-monotonous way, Ωh increases at first, and then decreases in a prograde accretion process. Therefore there exists a maximum of Ωh. It is pointed out that dimensionless angular momentum a* is more appropriate to describe the spinning state of a central black hole of an accretion disk than angular momentum J and angular velocity Ωh.
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  • Abstract views:  6478
  • PDF Downloads:  505
  • Cited By: 0
Publishing process
  • Received Date:  10 July 1998
  • Accepted Date:  23 November 1998
  • Published Online:  05 April 1999

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