# Detection of radial velocity shifts due to black hole binaries near merger

15 May 2015 McKernan B. Ford K. E. S.

The barycenter of a massive black hole binary will lie outside the event horizon of the primary black hole for modest values of mass ratio and binary separation. Analagous to radial velocity shifts in stellar emission lines caused by the tug of planets, the radial velocity of the primary black hole around the barycenter can leave a tell-tale oscillation in the broad component of Fe K$\alpha$ emission from accreting gas... (read more)

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• HIGH ENERGY ASTROPHYSICAL PHENOMENA
• ASTROPHYSICS OF GALAXIES