Revisiting vertical structure of neutrino-dominated accretion disks: Bernoulli parameter, neutrino trapping and other distributions |
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Authors: | Tong Liu Wei-Min Gu Li Xue Ju-Fu Lu |
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Institution: | 1. Department of Physics and Institute of Theoretical Physics and Astrophysics, Xiamen University, Xiamen, Fujian, 361005, China
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Abstract: | We revisit the vertical structure of neutrino-dominated accretion flows (NDAFs) in spherical coordinates with a new boundary
condition based on the mechanical equilibrium. The solutions show that NDAF is significantly thick. The Bernoulli parameter
and neutrino trapping are determined by the mass accretion rate and the viscosity parameter. According to the distribution
of the Bernoulli parameter, the possible outflow may appear in the outer region of the disk. The neutrino trapping can essentially
affect the neutrino radiation luminosity. The vertical structure of NDAF is like a “sandwich”, and the multilayer accretion
may account for the flares in gamma-ray bursts. |
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Keywords: | |
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