Relativistic Dynamics and Mass Exchange in Binary Black Hole Mini-disks
Relativistic Dynamics and Mass Exchange in Binary Black Hole Mini-disks
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DOI：
10.3847/1538-4357/aa63f3
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发表时间：
2016-12
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影响因子：
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通讯作者：
Dennis B. Bowen;M. Campanelli;J. Krolik;V. Mewes;S. Noble
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作者：
Dennis B. Bowen;M. Campanelli;J. Krolik;V. Mewes;S. Noble
我们首次探索了相对论双黑洞 (BH) 系统中的气体动力学，其中吸积盘（“迷你盘”）围绕每个 BH 运行。我们专注于可比质量、非旋转系统的二维流体动力学研究。相对论效应以多种方式改变该环境中气体的动力学。由于两个 BH 之间的引力势变得比牛顿体系中的更浅，因此迷你盘向 L1 点延伸，并且随着二元分离的减少，在迷你盘之间来回传递的气体量急剧增加。这种“晃动”以双星轨道频率的 2 倍和 2.75 倍进行准周期调制，对应于超大质量双星黑洞 (SMBBH) 的数小时到数天的时间尺度。此外，相对论效应将 m = 1 分量添加到圆盘中潮汐驱动的螺旋波中，而在牛顿引力中，这些螺旋波纯粹是 m = 2；当间隔≥100 引力半径时，该分量变得占主导地位。晃动波和螺旋波都有可能产生独特的辐射特征，这些特征可能是相对论区域中SMBBH的独特标志。
We present the first exploration of gas dynamics in a relativistic binary black hole (BH) system in which an accretion disk (a “mini-disk”) orbits each BH. We focus on 2D hydrodynamical studies of comparable-mass, non-spinning systems. Relativistic effects alter the dynamics of gas in this environment in several ways. Because the gravitational potential between the two BHs becomes shallower than in the Newtonian regime, the mini-disks stretch toward the L1 point and the amount of gas passing back and forth between the mini disks increases sharply with decreasing binary separation. This “sloshing” is quasi-periodically modulated at 2 and 2.75 times the binary orbital frequency, corresponding to timescales of hours to days for supermassive binary black holes (SMBBHs). In addition, relativistic effects add an m = 1 component to the tidally driven spiral waves in the disks that are purely m = 2 in Newtonian gravity; this component becomes dominant when the separation is ≲100 gravitational radii. Both the sloshing and the spiral waves have the potential to create distinctive radiation features that may uniquely mark SMBBHs in the relativistic regime.