Efficient merger of binary supermassive black holes in nonaxisymmetric galaxies

被引:209
作者
Berczik, P
Merritt, D
Spurzem, R
Bischof, HP
机构
[1] Rochester Inst Technol, Dept Phys, Rochester, NY 14623 USA
[2] Heidelberg Univ, Zentrum Astron, Astron Rech Inst, D-69120 Heidelberg, Germany
[3] Natl Akad Nauk Ukrainy, Holovna Astron Observ, UA-03680 Kiev, Ukraine
[4] Rochester Inst Technol, Dept Comp Sci, Rochester, NY 14623 USA
基金
美国国家科学基金会;
关键词
black hole physics; galaxies : evolution; galaxies : interactions;
D O I
10.1086/504426
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Binary supermassive black holes ( SBHs) form naturally in galaxy mergers, but their long-term evolution is uncertain. In spherical galaxies, N-body simulations show that binary evolution stalls at separations much too large for significant emission of gravitational waves ( the "final-parsec problem"). Here we follow the long-term evolution of a massive binary in more realistic, triaxial and rotating galaxy models with particle numbers as high as 10(6). We find that the binary does not stall. The binary hardening rates that we observe are sufficient to allow complete coalescence of binary SBHs in 10 Gyr or less, even in the absence of collisional loss-cone refilling or gasdynamical torques, thus providing a potential solution to the final-parsec problem.
引用
收藏
页码:L21 / L24
页数:4
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