Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-04-16
Astrophys.J.697:1621-1633,2009
Astronomy and Astrophysics
Astrophysics
v3: 36 pages, 1 figure; discussion on the validity of the model and estimates for the angular value of the spin-flip added to
Scientific paper
10.1088/0004-637X/697/2/1621
Massive merging black holes will be the primary sources of powerful gravitational waves at low frequency, and will permit to test general relativity with candidate galaxies close to a binary black hole merger. In this paper we identify the typical mass ratio of the two black holes but then show that the distance when gravitational radiation becomes the dominant dissipative effect (over dynamical friction) does not depend on the mass ratio. However the dynamical evolution in the gravitational wave emission regime does. For the typical range of mass ratios the final stage of the merger is preceded by a rapid precession and a subsequent spin-flip of the main black hole. This already occurs in the inspiral phase, therefore can be described analytically by post-Newtonian techniques. We then identify the radio galaxies with a super-disk as those in which the rapidly precessing jet produces effectively a powerful wind, entraining the environmental gas to produce the appearance of a thick disk. These specific galaxies are thus candidates for a merger of two black holes to happen in the astronomically near future.
Biermann Peter L.
Gergely László Á
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