Estimating the final spin of a binary black hole coalescence

被引:158
作者
Buonanno, Alessandra [1 ]
Kidder, Lawrence E. [2 ]
Lehner, Luis [3 ]
机构
[1] Univ Maryland, Dept Phys, Maryland Ctr Fundamental Phys, College Pk, MD 20742 USA
[2] Cornell Univ, Ctr Radiophys & Space Res, Ithaca, NY 14853 USA
[3] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA
来源
PHYSICAL REVIEW D | 2008年 / 77卷 / 02期
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevD.77.026004
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a straightforward approach for estimating the final black hole spin of a binary black hole coalescence with arbitrary initial masses and spins. Making some simple assumptions, we estimate the final angular momentum to be the sum of the individual spins plus the orbital angular momentum of a test particle orbiting at the last stable orbit around a Kerr black hole with a spin parameter of the final black hole. The formula we obtain is able to reproduce with reasonable accuracy the results from available numerical simulations, but, more importantly, it can be used to investigate what configurations might give rise to interesting dynamics. In particular, we discuss scenarios which might give rise to a flip in the direction of the total angular momentum of the system. By studying the dependence of the final spin upon the mass ratio and initial spins, we find that our simple approach suggests that it is not possible to spin-up a black hole to extremal values through merger scenarios irrespective of the mass ratio of the objects involved.
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页数:9
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