The next two decades are expected to open the door to the first coincident detections of
electromagnetic (EM) and gravitational-wave (GW) signatures associated with massive …

Recent work on the dynamical evolution of galactic nuclei containing supermassive black
holes is reviewed. Topics include galaxy structural properties, collisionless and collisional …

Recent numerical relativistic simulations of black hole coalescence suggest that in certain
alignments the emission of gravitational radiation can produce a kick of several thousand …

Knowledge of the spin of the black hole resulting from the merger of a generic black-hole
binary is of great importance for studying the cosmological evolution of supermassive black …

ABSTRACT We present MeerKAT 1.28 GHz total-intensity, polarization, and spectral-index
images covering the giant (projected length l≈ 1.57 Mpc) X-shaped radio source PKS …

Radio galaxies are known to go through cycles of activity, where phases of apparent
quiescence can be followed by repeated activity of the central supermassive black hole. A …

We develop a new analysis approach towards identifying related radio components and
their corresponding infrared host galaxy based on unsupervised machine learning methods …

The excellent sensitivity and optimum resolution of LoTSS DR2 at 144 MHz has enabled us
to discover a giant radio galaxy (J1225+ 4011) with three distinct episodes of jet activity …

A small number of double-lobed radio galaxies (17 from our own census of the literature)
show an additional pair of low surface brightness" wings," thus forming an overall X-shaped …

I review the observational evidence for the presence of supermassive binary black holes in
galaxies and for the presence of active pairs of galaxies. According to hierarchical galaxy …