Accretion Disk Reversal and the Spin-up/Spin-down of Accreting Pulsars
Accretion Disk Reversal and the Spin-up/Spin-down of Accreting Pulsars
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吸积盘反转和吸积脉冲星的自旋向上/自旋向下
DOI：
10.1086/307051
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Jianke Li
中科院分区：
文献类型：
--
作者：
J. Murray;M. de Kool;Jianke Li
我们数值研究吸积盘反转的流体动力学，并将我们的研究结果与在吸积X射线脉冲星GX 1+4中观察到的自旋速率变化联系起来。在这个系统中，从一个缓慢的风吸积，吸积盘包含两个动态不同的区域。在内部，粘性力占主导地位，盘的演化发生在粘性时间尺度上。在外部，具有相反角动量的材料的动态混合更重要，并且外部施加的角动量反转时间尺度控制流动。在这个外部区域，圆盘被分成具有相反旋转方向的同心材料环，这些材料环不会完全混合，而是保持不同，它们之间有明显的间隙。因此，我们预测，扭矩逆转所造成的吸积盘逆转将伴随着吸积光度的最小值。
We numerically investigate the hydrodynamics of accretion disk reversal and relate our findings to the observed spin-rate changes in the accreting X-ray pulsar GX 1+4. In this system, which accretes from a slow wind, the accretion disk contains two dynamically distinct regions. In the inner part viscous forces are dominant, and disk evolution occurs on a viscous timescale. In the outer part dynamical mixing of material with opposite angular momentum is more important, and the externally imposed angular momentum reversal timescale governs the flow. In this outer region the disk is split into concentric rings of material with opposite senses of rotation that do not mix completely but instead remain distinct, with a clear gap between them. We thus predict that torque reversals resulting from accretion disk reversals will be accompanied by minima in accretion luminosity.