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Title:
Superkicks in Hyperbolic Encounters of Binary Black Holes
Authors:
Healy, James; Herrmann, Frank; Hinder, Ian; Shoemaker, Deirdre M.; Laguna, Pablo; Matzner, Richard A.
Affiliation:
AA(Center for Gravitational Wave Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA), AB(Center for Gravitational Wave Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA), AC(Center for Gravitational Wave Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA), AD(Center for Gravitational Wave Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA; Center for Relativistic Astrophysics and School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA), AE(Center for Gravitational Wave Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA; Center for Relativistic Astrophysics and School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA), AF(Center for Relativity and Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA)
Publication:
Physical Review Letters, vol. 102, Issue 4, id. 041101 (PhRvL Homepage)
Publication Date:
01/2009
Origin:
APS
PACS Keywords:
Numerical studies of black holes and black-hole binaries, Gravitational-wave astrophysics, Classical black holes, Black holes
DOI:
10.1103/PhysRevLett.102.041101
Bibliographic Code:
2009PhRvL.102d1101H

Abstract

Generic inspirals and mergers of binary black holes produce beamed emission of gravitational radiation that can lead to a gravitational recoil or kick of the final black hole. The kick velocity depends on the mass ratio and spins of the binary as well as on the dynamics of the binary configuration. Studies have focused so far on the most astrophysically relevant configuration of quasicircular inspirals, for which kicks as large as ˜3300kms-1 have been found. We present the first study of gravitational recoil in hyperbolic encounters. Contrary to quasicircular configurations, in which the beamed radiation tends to average during the inspiral, radiation from hyperbolic encounters is plunge dominated, resulting in an enhancement of preferential beaming. As a consequence, it is possible in highly relativistic scatterings to achieve kick velocities as large as 10000kms-1.
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