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arXiv 0812.2756astro-ph
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星系核中的双黑洞合并:后牛顿模拟

Binary Black Hole Merger in Galactic Nuclei: Post-Newtonian Simulations

Ingo Berentzen, Miguel Preto, Peter Berczik, David Merritt, Rainer Spurzem

摘要:

本文研究了旋转星系核中双星超大质量黑洞(SMBHs)的形成和演化,重点讨论了恒星动力学的作用。我们提出了第一个N-体模拟,遵循SMBHs的演变从千秒差距的分离一直到他们最终的相对论合并,并且可以鲁棒地缩放到真正的星系。的N-体代码包括后牛顿(PN)修正的二进制运动方程的顺序为2.5,我们表明,只有正确地再现的大规模二进制的演变,如果保守的1 PN和2 PN条款。在我们的模拟中,大质量双星的轨道偏心率经常被发现保持很大,直到合并之前不久。这不仅直接影响它们的轨道演化速率,而且对相对论性螺旋期间发射的引力波形也有重要影响。我们估计引力波振幅时,频率下降的频带内(计划)的激光干涉仪空间望远镜(LISA)。我们发现显着的贡献-远高于LISA灵敏度曲线-从高次谐波。

英文摘要:

This paper studies the formation and evolution of binary supermassive black holes (SMBHs) in rotating galactic nuclei, focusing on the role of stellar dynamics. We present the first N-body simulations that follow the evolution of the SMBHs from kiloparsec separations all the way to their final relativistic coalescence, and that can robustly be scaled to real galaxies. The N-body code includes post-Newtonian (PN) corrections to the binary equations of motion up to order 2.5; we show that the evolution of the massive binary is only correctly reproduced if the conservative 1PN and 2PN terms are included. The orbital eccentricities of the massive binaries in our simulations are often found to remain large until shortly before coalescence. This directly affects not only their orbital evolution rates, but has important consequences as well for the gravitational waveforms emitted during the relativistic inspiral. We estimate gravitational wave amplitudes when the frequencies fall inside the band of the (planned) Laser Interferometer Space Antennae (LISA). We find significant contributions -- well above the LISA sensitivity curve -- from the higher-order harmonics.

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