2009ApJ...695..363H

SDSSJ092712.65+294344.0 was identified by the Sloan Digital Sky Survey 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 contains only narrow lines. In the first paper commenting on this system, 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. In two other papers, it was interpreted as a small-separation binary black hole. We propose a new interpretation: that this system is a more distant analog of NGC 1275, a large and small galaxy interacting near the center of a rich cluster.