086438

The coalescence of binary supermassive black holes openParSMBHclosePar 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 fi rst XMM-Newton and HST imaging of RXJ1756.4+5235 comma 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.

星系并合过程中双超大质量黑洞（SMBH）的并合，被认为是最强的引力波源。理论表明，这类引力波携带动量，会使并合后的黑洞产生速度反冲（或称“踢击”），进而将其从宿主星系的中心位移甚至完全抛出。我们请求对RXJ1756.4+5235开展首次XMM-牛顿望远镜与哈勃空间望远镜（HST）成像观测：该源拥有一颗偏离邻近星系核的宽线点源，旨在明确该源究竟是潜在的反冲黑洞，还是一对密近双活动星系核（Active Galactic Nucleus，AGN）。