The quest for binary and dual supermassive black holes (SMBHs) at the dawn of the multi-
messenger era is compelling. Detecting dual active galactic nuclei (AGN)–active SMBHs at …

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 …

We analyze the parsec-scale jet kinematics from 2007 June to 2018 December of a sample
of γ-ray bright blazars monitored roughly monthly with the Very Long Baseline Array (VLBA) …

The nearby radio galaxy M87 offers a unique opportunity to explore the connections
between the central supermassive black hole and relativistic jets. Previous studies of the …

The observation of quasars at very high redshift such as Pōniuā'ena is a challenge for
models of supermassive black hole (SMBH) formation. This work presents a study of SMBH …

The combined study of the flaring of active galactic nuclei (AGNs) at radio wavelengths and
parsec-scale jet kinematics with Very Long Baseline Interferometry has led to the view that …

The radio source J1924–2914 (PKS 1921–293, OV–236) is a radio-loud quasar at a redshift
z= 0.353 (Wills & Wills 1981; Jones et al. 2009). The source exhibits strong optical variability …

Most large galaxies host supermassive black holes in their nuclei and are subject to
mergers, which can produce a supermassive black hole binary (SMBHB), and hence …

ABSTRACT The project MOMO (Multiwavelength Observations and Modelling of OJ 287)
was set up to test predictions of binary supermassive black hole (SMBH) scenarios and to …

We present the first polarimetric space very long baseline interferometry (VLBI) observations
of OJ 287, observed with RadioAstron at 22 GHz during a perigee session on 2014 April 4 …