On the Bardeen???Petterson effect in black hole accretion discs
On the Bardeen???Petterson effect in black hole accretion discs
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关于黑洞吸积盘中的巴丁？？？佩特森效应
DOI：
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
C. Nixon
中科院分区：
文献类型：
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作者：
R. Nealon;Daniel J. Price;C. Nixon
我们研究了黑洞自旋对翘曲或错位吸积盘的影响-特别是i）内部盘边缘是否与黑洞自旋对齐，ii）盘是否可以保持对齐的内部盘和错位的外部盘之间的平滑过渡，称为Bardeen-Petterson效应。我们采用高分辨率的3D光滑粒子流体动力学模拟的光盘受到透镜-Thirring进动，集中在弯曲波制度的光盘粘度小于纵横比。H=R。我们首先解决的争议，在文献中关于可能的稳态振荡的倾斜接近黑洞。我们成功地恢复了这种振荡在3D在小和中等倾角（。15），提供了两个透镜Thirring和爱因斯坦进动存在，足够的分辨率被采用，并提供光盘不是那么厚，以简单地吸积失调。第二，我们发现，光盘倾斜超过几度一般陡峭和打破，而不是保持一个平稳的过渡，再次在以前的研究结果相反，但只有一次光盘规模的高度得到充分解决。最后，我们发现，当盘平面是错位的黑洞自旋一个大的角度，光盘'撕裂'成离散的环，有效地独立进动，并导致快速吸积，与以前的研究结果在扩散制度（& H=R）。因此，无论圆盘是厚还是薄，圆盘和黑洞自旋轴之间的错位都为黑洞的快速生长提供了一个强大的机制。
We investigate the effect of black hole spin on warped or misaligned accretion discs — in particular i) whether or not the inner disc edge aligns with the black hole spin and ii) whether the disc can maintain a smooth transition between an aligned inner disc and a misaligned outer disc, known as the Bardeen-Petterson effect. We employ high resolution 3D smoothed particle hydrodynamics simulations of -discs subject to Lense-Thirring precession, focussing on the bending wave regime where the disc viscosity is smaller than the aspect ratio . H=R. We first address the controversy in the literature regarding possible steady-state oscillations of the tilt close to the black hole. We successfully recover such oscillations in 3D at both small and moderate inclinations (. 15 ), provided both Lense-Thirring and Einstein precession are present, sufficient resolution is employed, and provided the disc is not so thick so as to simply accrete misaligned. Second, we find that discs inclined by more than a few degrees in general steepen and break rather than maintain a smooth transition, again in contrast to previous findings, but only once the disc scale height is adequately resolved. Finally, we find that when the disc plane is misaligned to the black hole spin by a large angle, the disc ‘tears’ into discrete rings which precess effectively independently and cause rapid accretion, consistent with previous findings in the diffusive regime ( & H=R). Thus misalignment between the disc and the spin axis of the black hole provides a robust mechanism for growing black holes quickly, regardless of whether the disc is thick or thin.
影响因子：
6.5
作者：
M. Fragner;R. Nelson
通讯作者：
M. Fragner;R. Nelson