Circumbinary Disk Accretion into Spinning Black Hole Binaries
Circumbinary Disk Accretion into Spinning Black Hole Binaries
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DOI：
10.3847/1538-4357/abf0af
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发表时间：
2021-01
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影响因子：
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通讯作者：
F. L. Lopez Armengol;L. Combi;M. Campanelli;S. Noble;J. Krolik;Dennis B. Bowen;M. Avara;V. Mewes;H. Nakano
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作者：
F. L. Lopez Armengol;L. Combi;M. Campanelli;S. Noble;J. Krolik;Dennis B. Bowen;M. Avara;V. Mewes;H. Nakano
超大质量黑洞双星很可能通过一个环绕双星的吸积盘吸积星际气体。在合并前不久，这个环绕双星的吸积盘的内部会受到广义相对论效应的影响。为了研究这种情况，我们通过叠加两个推进的克尔 - 希尔德项来近似近轨道黑洞的时空度规。在证明了这种近似的质量之后，我们对环绕双星的吸积盘进行了非常长期的广义相对论磁流体动力学模拟。我们考虑无量纲自旋参数大小为0.9的黑洞，在一次模拟中自旋与双星的轨道角动量平行，而在另一次模拟中反平行。这些情况与无自旋模拟形成对比。我们发现，对于环绕双星吸积盘内部的固定表面质量密度，这种大小的同向自旋大约会使质量吸积率降低14%，反向自旋会使其增加45%，而许多其他吸积盘的性质保持不变。
Supermassive black hole binaries are likely to accrete interstellar gas through a circumbinary disk. Shortly before merger, the inner portions of this circumbinary disk are subject to general relativistic effects. To study this regime, we approximate the spacetime metric of close orbiting black holes by superimposing two boosted Kerr–Schild terms. After demonstrating the quality of this approximation, we carry out very long-term general relativistic magnetohydrodynamic simulations of the circumbinary disk. We consider black holes with spin dimensionless parameters of magnitude 0.9, in one simulation parallel to the orbital angular momentum of the binary, but in another anti-parallel. These are contrasted with spinless simulations. We find that, for a fixed surface mass density in the inner circumbinary disk, aligned spins of this magnitude approximately reduce the mass accretion rate by 14% and counter-aligned spins increase it by 45%, leaving many other disk properties unchanged.