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arXiv:0706.0124 (astro-ph)
[Submitted on 1 Jun 2007 (v1), last revised 30 Aug 2007 (this version, v2)]

Title:Influence of the Magnetic Coupling Process on the Advection Dominated Accretion Flows around Black Holes

Authors:R. Y. Ma, F. Yuan, D. X. Wang
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Abstract: A large-scale closed magnetic field can transfer angular momentum and energy between a black hole (BH) and its surrounding accretion flow. We investigate the effects of this magnetic coupling (MC) process on the dynamics of a hot accretion flow (e.g., an advection dominated accretion flow, hereafter ADAF). The energy and angular momentum fluxes transported by the magnetic field are derived by an equivalent circuit approach. For a rapidly rotating BH, it is found that the radial velocity and the electron temperature of the accretion flow decrease, whereas the ion temperature and the surface density increase. The significance of the MC effects depends on the value of the viscous parameter \alpha. The effects are obvious for \alpha=0.3 but nearly ignorable for \alpha=0.1. For a BH with specific angular momentum, a_*=0.9, and \alpha=0.3, we find that for reasonable parameters the radiative efficiency of a hot accretion flow can be increased by about 30%.
Comments: 21 pages, 7 figures. Changed after the referee's suggestions. Accepted for publication in the Astrophysical Journal
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:0706.0124 [astro-ph]
  (or arXiv:0706.0124v2 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0706.0124
Related DOI: https://doi.org/10.1086/522917

Submission history

From: Renyi Ma [view email]
[v1] Fri, 1 Jun 2007 11:10:31 UTC (35 KB)
[v2] Thu, 30 Aug 2007 12:54:27 UTC (42 KB)
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