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Gravitational Instability in Neutrino Dominated Accretion Disks |
| LIU Tong**, XUE Li
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Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen 361005
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| Cite this article: |
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LIU Tong, XUE Li 2011 Chin. Phys. Lett. 28 129802 |
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Abstract We revisit the vertical structure of neutrino-dominated accretion flows (NDAFs) in spherical coordinates under a boundary condition based on a mechanical equilibrium. The solutions show that the NDAF is significantly geometrically thick. The Toomre parameter is determined by the mass accretion rate and the viscosity parameter, which is defined as Q=cS Ω/πGΣ, where cS , Ω and Σ are the sound speed, angular velocity and surface density, respectively. According to the distribution of the Toomre parameter, the possible fragments of the disk may appear near the disk surface in the outer region. These possible outflows originating from the gravitational instability of the disk may account for the late-time flares in gamma-ray bursts.
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| Keywords:
98.62.Mw
97.60.Lf
98.70.Rz
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Received: 07 August 2011
Published: 29 November 2011
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