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Alpha-Viscosity Eff...
Alpha-Viscosity Effects in Slender Tori
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Horak, J. (författare)
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- Abramowicz, Marek A, 1945 (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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- Levin, Lina (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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visa fler...
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- Slapak, Rikard (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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Straub, O. (författare)
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visa färre...
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(creator_code:org_t)
- 2012
- 2012
- Engelska.
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Ingår i: Publications of the Astronomical Society of Japan. - 0004-6264. ; 64:4
- Relaterad länk:
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https://gup.ub.gu.se...
Abstract
Ämnesord
Stäng
- We explore effects of the Shakura-Sunyaev alpha-viscosity on the dynamics and oscillations of slender tori. We start with a slow secular evolution of the torus. We show that the angular-momentum profile approaches the Keplerian one on a timescale longer than a dynamical one by a factor on the order of 1/alpha. We then focus our attention on the oscillations of the torus. We discuss the effects of various angular-momentum distributions. Using a perturbation theory, we have found a rather general result that the high-order acoustic modes are damped by the viscosity, while the high-order inertial modes are enhanced. We calculate viscous growth rates for the lowest-order modes, and show that already the lowest-order inertial mode is unstable for less-steep angular-momentum profiles, or very close to the central gravitating object.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Nyckelord
- accretion disks
- X-rays: binaries
- accretion disks
- oscillations
- stability
- modes
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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