The First Glimpse of A Candidate Recoiling Black Hole

The coalescence of binary supermassive black holes (SMBH) in galaxy mergers is thought to constitute the strongest source of gravitational waves. Theory suggests these waves carry momentum causing the merged black hole to experience a velocity recoil or kick that displaces or indeed ejects it from the center of its host galaxy. We request the first XMM-Newton and HST imaging of RXJ1756.4+5235, a source with an o ffset broad line point source that is offset from the nucleus of a nearby galaxy to resolve whether the source is a potential recoiling black hole or a close dual AGN.