SDSSJ092712.65+294344.0: NGC 1275 at z=0.7?

Understand

SDSSJ092712.65+294344.0 was identified by the SDSS as a quasar, but has the unusual property of having two emission line systems offset by 2650 km/s.

• One of these contains the usual combination of broad and narrow lines, the other only narrow lines.
• In the first paper commenting on this system (Komossa et al.
• 2008), it was interpreted as a galaxy in which a pair of black holes had merged, imparting a several thousand km/s recoil to the new, larger black hole.