Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-27
Phys.Rev.D74:087503,2006
Astronomy and Astrophysics
Astrophysics
To appear in Physical Review D. 4 pages, 3 figures, RevTex
Scientific paper
10.1103/PhysRevD.74.087503
Three-body interactions are expected to be common in globular clusters and in galactic cores hosting supermassive black holes. Here we consider an equal-mass binary-black-hole system in the presence of a third black hole. Using numerically generated binary-black-hole initial-data sets, and first- and second-order post-Newtonian (1PN and 2PN) techniques, we find that the presence of the third black hole has non-negligible relativistic effects on the location of the innermost stable circular orbit (ISCO), and that these effects arise at 2PN order. In particular, we study the more astrophysically realistic situation of a stellar-mass black-hole binary in orbit about a third supermassive black hole. In general, the proximity of the massive black hole has stabilizing effects on the orbiting binary, leading to an increase in merger time and a decrease of the terminal orbital frequency, and an amplification of the gravitational radiation emitted from the binary system by up to 6 percent.
Campanelli Manuela
Dettwyler Miranda
Hannam Mark
Lousto Carlos O.
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