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arXiv 1209.4085gr-qcastro-ph.COastro-ph.GAastro-ph.HE
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从椭圆吸气到双曲相遇的偏心黑洞并合和变焦-旋转行为

Eccentric black hole mergers and zoom-whirl behavior from elliptic inspirals to hyperbolic encounters

Roman Gold, Bernd Bruegmann

摘要:

在数值相对论中,我们对非自旋的等质量和不等质量黑洞双星在一般偏心轨道上的参数进行了研究。所考虑的线性动量范围从圆形轨道的动量到该值的十倍。我们讨论了在双曲和椭圆区的变焦旋转行为的不同表现形式。双曲线数据集适用于动态捕获场景(例如在球状星团中)。椭圆区的演化对应于超大质量黑洞双星可能的终态。我们现场变焦旋转行为的偏心率低$e\sim0.5$,即在预期范围内的偏心率在大规模黑洞双星星系合并和双星星系中心附近。由此产生的重力波形揭示了丰富的结构,这将有效地打破参数空间中的退化,改善参数估计。

英文摘要:

We perform a parameter study of non-spinning, equal and unequal mass black hole binaries on generic, eccentric orbits in numerical relativity. The linear momentum considered ranges from that of a circular orbit to ten times that value. We discuss the different manifestations of zoom-whirl behavior in the hyperbolic and the elliptic regime. The hyperbolic data set applies to dynamical capture scenarios (e.g. in globular clusters). Evolutions in the elliptic regime correspond to possible end states of supermassive black hole binaries. We spot zoom-whirl behavior for eccentricities as low as $e\sim0.5$, i.e. within the expected range of eccentricities in massive black hole binaries from galaxy mergers and binaries near galactic centers. The resulting gravitational waveforms reveal a rich structure, which will effectively break degeneracies in parameter space improving parameter estimation.

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