Abstract
The coalescence of massive black hole (MBH) binaries following galaxy mergers is one of the main sources of low-frequency radiation. A higher order relativistic phenomenon, the recoil as a result of the nonzero net linear momentum carried away by waves, may have interesting consequences for the demography of MBHs at the centers of galaxies. We study the dynamics of recoiling MBHs and its observational consequences. The gravitational rocket may (1) deplete MBHs from late-type spiral galaxies, dwarf galaxies, and stellar clusters; (2) produce off-nuclear quasars, including unusual radio morphologies during the recoil of a radio-loud source; and (3) give rise to a population of interstellar and intergalactic MBHs.
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