Unequal Mass Binary Black Hole Plunges and Gravitational Recoil

Details Unequal Mass Binary Black Hole Plunges and Gravitational Recoil Unequal Mass Binary Black Hole Plunges and Gravitational Recoil

2006-01-06

arxiv.org/abs/gr-qc/0601026v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, 5 figures, to appear in "New Frontiers" special issue of CQG

Scientific paper

10.1088/0264-9381/24/12/S04

We present results from fully nonlinear simulations of unequal mass binary black holes plunging from close separations well inside the innermost stable circular orbit with mass ratios q = M_1/M_2 = {1,0.85,0.78,0.55,0.32}, or equivalently, with reduced mass parameters $\eta=M_1M_2/(M_1+M_2)^2 = {0.25, 0.248, 0.246, 0.229, 0.183}$. For each case, the initial binary orbital parameters are chosen from the Cook-Baumgarte equal-mass ISCO configuration. We show waveforms of the dominant l=2,3 modes and compute estimates of energy and angular momentum radiated. For the plunges from the close separations considered, we measure kick velocities from gravitational radiation recoil in the range 25-82 km/s. Due to the initial close separations our kick velocity estimates should be understood as a lower bound. The close configurations considered are also likely to contain significant eccentricities influencing the recoil velocity.

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