Supermassive Black Hole Binaries: The Search Continues
  Gravitationally bound supermassive black hole binaries (SBHBs) are thought to be a natural product of galactic mergers and growth of the large scale structure in the universe. They however remain observationally elusive, thus raising a question about characteristic observational signatures associated with these systems. In this conference proceeding I discuss current theoretical understanding and latest advances and prospects in observational searches for SBHBs. 
Tamara Bogdanovic (Georgia Institute of Technology)
astro-ph.HE astro-ph.GA gr-qc