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arXiv 1306.6690astro-ph.HE
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伽玛暴中X射线耀斑的磁耦合中子冷却吸积模型

Neutrino-cooled Accretion Model with Magnetic Coupling for X-ray Flares in GRBs

Yang Luo, Wei-Min Gu, Tong Liu, Ju-Fu Lu

摘要:

中微子冷却的吸积盘被认为是伽马射线暴的中心引擎,但在解释瞬发γ射线爆发后的X射线耀斑时遇到了困难。本文考虑了内盘与中心黑洞之间的磁耦合。对于$0.001 \sim 0.1 M_{\sun} s^{-1}$周围的质量吸积率,我们的结果表明,由于耦合效应,中微子湮灭的亮度可以显著增强。因此,在伽马射线发射之后,具有质量$M_{disk} \la 0.5 M_{\sun}$的残留盘可以为大多数观测到的X射线耀斑提供动力,其静止帧持续时间小于100秒。此外,磁耦合过程和Blandford-Znajek机制之间的比较显示在黑洞旋转能量的提取。

英文摘要:

The neutrino-cooled accretion disk, which was proposed to work as the central engine of gamma-ray bursts, encounters difficulty in interpreting the X-ray flares after the prompt gamma-ray emission. In this paper, the magnetic coupling between the inner disk and the central black hole is taken into consideration. For mass accretion rates around $0.001 \sim 0.1 M_{\sun} s^{-1}$, our results show that the luminosity of neutrino annihilation can be significantly enhanced due to the coupling effects. As a consequence, after the gamma-ray emission, a remnant disk with mass $M_{disk} \la 0.5 M_{\sun}$ may power most of the observed X-ray flares with the rest frame duration less than 100 seconds. In addition, a comparison between the magnetic coupling process and the Blandford-Znajek mechanism is shown on the extraction of black hole rotational energy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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