垂直平流对超吸积盘的影响及伽马射线暴与Kilonovae的潜在联系
Vertical Advection Effects on Hyper-accretion Disks and Potential Link between Gamma-ray Bursts and Kilonovae
摘要：
最近对超爱丁顿吸积流的模拟表明，除了扩散过程外，基于磁浮力的垂直平流可以是一个更有效的过程，以释放光学厚盘中的捕获光子。因此，来自吸积盘的辐射光度可以远远超过爱丁顿值。根据这一精神，我们重新访问的结构和辐射的超吸积盘的质量吸积率范围内$10^{-3}\sim 10~M_{\sun}~{\rm s}^{-1}$。结果表明，由于垂直平流的强冷却作用，盘的温度比没有垂直平流的经典模型中的温度低，因此盘的中微子光度也低。另一方面，通过垂直平流释放的伽马射线光子可以是非常超爱丁顿的。我们认为，大量逃逸的γ射线光子对原始火球的贡献可能比中微子湮灭更大，并可能暗示了黑洞超吸积情景中伽马射线暴与千中子爆之间的联系.
英文摘要：
Recent simulations on super-Eddington accretion flows have shown that, apart from the diffusion process, the vertical advection based on magnetic buoyancy can be a more efficient process to release the trapped photons in the optically thick disk. As a consequence, the radiative luminosity from the accretion disk can be far beyond the Eddington value. Following this spirit, we revisit the structure and radiation of hyper-accretion disks with mass accretion rates in the range $10^{-3}\sim 10~M_{\sun}~{\rm s}^{-1}$. Our results show that, due to the strong cooling through the vertical advection, the disk temperature becomes lower than that in the classic model without the vertical advection process, and therefore the neutrino luminosity from the disk is lower. On the other hand, the gamma-ray photons released through the vertical advection can be extremely super-Eddington. We argue that the large amount of escaped gamma-ray photons may have more significant contribution to the primordial fireball than the neutrino annihilation, and may hint a link between gamma-ray bursts and kilonovae in the black hole hyper-accretion scenario.
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