A MILLIPARSEC SUPERMASSIVE BLACK HOLE BINARY CANDIDATE IN THE GALAXY SDSS J120136.02+300305.5

摘要: Galaxy mergers play a key role in the evolution of galaxies and growth their central supermassive black holes (SMBHs). A search for (active) SMBH binaries (SMBHBs) at centers merger remnants is currently ongoing. Perhaps greatest challenge to identify inactive SMBHBs, which might be most abundant, but are also difficult identify. Liu et al. predicted characteristic drops light curves tidal disruption events (TDEs), caused by presence secondary SMBH. Here, we apply that model curve optically galaxy SDSS J120136.02+300305.5, was identified as candidate TDE with XMM-Newton. We show deep dips its evolving X-ray can well explained SMBHB core. mass primary M {sub BH} = 10{sup 7} ☉}, ratio q ≅ 0.08, semi-major axis b} 0.6 mpc good agreement observations. Given mass, introducing an orbital eccentricity needed, e 0.3. Alternatively, lower Mmore » 6} ☉} circular orbit fits well. Tight like this one, have already overcome 'final parsec problem', prime sources gravitational wave radiation once two SMBHs coalesce. Future transient surveys, will detect TDEs large numbers, place tight constraints on fraction otherwise non-active galaxies.« less