Causal Viscosity in Global Dynamics of Advection-Dominated Accretion Flows Around Black Holes

Chin. Phys. Lett.

2000, Vol. 17

Issue (2): 151-153 DOI:

Original Articles

Causal Viscosity in Global Dynamics of Advection-Dominated Accretion Flows Around Black Holes

GU Wei-Min¹;LU Ju-Fu^1,2

¹Center for Astrophysics, University of Science and Technology of China, Hefei 230026 ²National Astronomical Observatories, Chinese Academy of Sciences

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GU Wei-Min, LU Ju-Fu 2000 Chin. Phys. Lett. 17 151-153

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Abstract We modify the viscosity to disappear inside the sonic point in the advection-dominated accretion flows (ADAF’s) around black holes, and obtain the causally connected, physically self-consistent ADAF-thin disk solutions. Such global solutions differ from previous ones in quantitative details. The results show that the range of variation for the value of the outer boundary R_out is very large, from 30R_g to 10⁶R_g. There is a narrow region for which the rotating motion of the flow is super-Keplerian in each global solution. An example global solution with the causal viscosity is given explicitly, for which R_s = 2.28R_g and j = 1.7564(cR_g).

Keywords: 98.62.Mw

Published: 01 February 2000

PACS:

98.62.Mw

(Infall, accretion, and accretion disks)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2000/V17/I2/0151

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