| Effects of Magnetic Fields on Neutrino-dominated Accretion Model for Gamma-ray Bursts |
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| 作者姓名： | Yi Xie Chang-Yin Huang Wei-Hua Lei |
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| 作者单位： | 1，2 |
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| 摘 要： | Many models of gamma-ray bursts suggest a common central engine:a black hole of several solar masses accreting matter from a disk at an accretion rate from 0.01 to 10 M_⊙s~(-1),the inner region of the disk is cooled by neutrino emission and large amounts of its binding energy are liberated,which could trigger the fireball.We improve the neutrino- dominated accreting flows by including the effects of magnetic fields.We find that more than half of the liberated energy can be extracted directly by the large-scale magnetic fields in the disk,and it turns out that the temperature of the disk is a bit lower than the neutrino-dominated accreting flows without magnetic field.Therefore,the outflows are magnetically-dominated rather than neutrino dominated.In our model,the neutrino mechanism can fuel some GRBs (not the brightest ones),but cannot fuel X-ray flares.The magnetic processes(both BZ and electromagnetic luminosity from a disk)are viable mechanisms for most of GRBs and their following X-ray flares.
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| 关 键 词： | magnetic fields—accretion accretion disks—neutrinos—gamma rays bursts |
| 修稿时间： | 2007-01-14 |
Effects of Magnetic Fields on Neutrino-dominated Accretion Model for Gamma-ray Bursts |
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| Yi Xie Chang-Yin Huang Wei-Hua Lei.Effects of Magnetic Fields on Neutrino-dominated Accretion Model for Gamma-ray Bursts[J].Chinese Journal of Astronomy and Astrophysics,2007,7(5):685-692. |
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| Authors: | Yi Xie Chang-Yin Huang Wei-Hua Lei |
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| Abstract: | |
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| Keywords: | magnetic fields - accretion accretion disks- neutrinos - gamma rays bursts |
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