Observational Constraints on Gravitational Wave Recoil Kick Velocities in Supermassive Black Hole Binaries from Radio Galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

In recent years, general relativity simulations of binary black hole mergers have demonstrated that large `kicks' due to gravitational wave radiation recoil are possible. An observable manifestation of this phenomena would be a displacement of the resultant active nucleus from its parent host galaxy. We test this interesting possibility with measurements of a large sample of radio galaxies, focusing in particular on the class with double-double morphologies. The unusual morphologies of the double-doubles suggest a relatively recent merger, and such angular offset measurements place useful observational constraints on possible kick velocities resulting from mergers of super-massive black hole binaries.

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