Non-stationary hyperaccretion of stellar-mass black holes in three dimensions: torus evolution and neutrino emission
Non-stationary hyperaccretion of stellar-mass black holes in three dimensions: torus evolution and neutrino emission
复制标题
恒星质量黑洞在三个维度上的非平稳超吸积：环面演化和中微子发射
DOI：
10.1111/j.1365-2966.2004.07974.x
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发表时间：
2004
影响因子：
4.8
通讯作者：
H. Janka
中科院分区：
文献类型：
--
作者：
S. Setiawan;M. Ruffert;H. Janka
我们给出了超吸积恒星质量黑洞周围自引力、厚吸积盘演化的三维流体动力学模拟。黑洞-环面系统被认为是致密物体合并的残余物，在这种情况下，圆盘不受外部质量库的馈送，吸积是非稳定的。我们的模型考虑了由α定律描述的粘性耗散，盘气体的详细状态方程，以及通过使用黑洞的伪牛顿势对盘结构的一般相对论影响的近似处理，包括黑洞在吸积过程中可能的旋转和自旋。磁场被忽略。用中微子捕获方案处理热盘的中微子发射，并在后处理步骤中评估热盘附近的vv湮灭。我们的模拟表明，中微子发射和能量沉积随盘质量、黑洞自转以及α粘性的增加而灵敏地增加。我们发现，对于足够大的α粘性，vv湮没可以成为伽马射线暴的一种可行的能量来源。
We present three-dimensional hydrodynamic simulations of the evolution of self-gravitating, thick accretion discs around hyperaccreting stellar-mass black holes. The black hole-torus systems are considered to be remnants of compact object mergers, in which case the disc is not fed by an external mass reservoir and the accretion is non-stationary. Our models take into account viscous dissipation, described by an α-law, a detailed equation of state for the disc gas, and an approximate treatment of general relativistic effects on the disc structure by using a pseudo-Newtonian potential for the black hole including its possible rotation and spin-up during accretion. Magnetic fields are ignored. The neutrino emission of the hot disc is treated by a neutrino-trapping scheme, and the vv-annihilation near the disc is evaluated in a post-processing step. Our simulations show that the neutrino emission and energy deposition by vv-annihilation increase sensitively with the disc mass, with the black hole spin in case of a disc in corotation, and in particular with the α-viscosity. We find that for sufficiently large α-viscosity, vv-annihilation can be a viable energy source for gamma-ray bursts.