Abstract The Event Horizon Telescope (EHT) Collaboration recently published the first
images of the supermassive black holes in the cores of the Messier 87 and Milky Way …

NANOGrav and other Pulsar Timing Arrays (PTAs) have discovered a common-spectrum
process in the nHz range that may be due to gravitational waves (GWs): if so, they are likely …

Blazars are active galactic nuclei (AGN) with relativistic jets whose non-thermal radiation is
extremely variable on various timescales,–. This variability seems mostly random, although …

Decades long monitoring of millisecond pulsars, which exhibit highly stable rotational
periods in pulsar timing array experiments is on the threshold of discovering nanohertz …

We present revised (black hole mass)–(spheroid stellar mass) and (black hole mass)–
(galaxy stellar mass) scaling relations based on colour-dependent (stellar mass)-to-light …

We present fully relativistic predictions for the electromagnetic emission produced by
accretion disks surrounding spinning and nonspinning supermassive binary black holes on …

The bright blazar OJ 287 routinely parades high brightness bremsstrahlung flares, which are
explained as being a result of a secondary supermassive black hole (SMBH) impacting the …

We conduct a systematic search for quasars with periodic variations from the archival
photometric data of the Zwicky Transient Facility by cross-matching with the quasar …

Extreme mass-ratio inspirals (EMRIs) take place when a stellar-mass black hole (BH)
merges with a supermassive BH (SMBH). The gravitational-wave emission from such an …

ABSTRACT A complete census of active galactic nuclei (AGNs) is a prerequisite for
understanding the growth of supermassive black holes across cosmic time. A significant …