The nuclei of most normal galaxies contain supermassive black holes, which can accrete
gas through a disk and become active. These active galactic nuclei (AGNs) can form jets that …

Relativistic jets of active galactic nuclei have been known to exist for 100 years. Blazars with
their jet pointing close to our line of sight are some of the most variable and extreme objects …

ABSTRACT The Nuclear Spectroscopic Telescope Array (NuSTAR) mission, launched on
2012 June 13, is the first focusing high-energy X-ray telescope in orbit. NuSTAR operates in …

We analyze the parsec-scale jet kinematics from 2007 June to 2013 January of a sample of
γ-ray bright blazars monitored roughly monthly with the Very Long Baseline Array at 43 GHz …

We present ten years of R-band monitoring data of 31 northern blazars which were either
detected at very high-energy (VHE) gamma rays or listed as potential VHE gamma-ray …

ABSTRACT On 2015 June 16, Fermi-LAT observed a giant outburst from the flat spectrum
radio quasar 3C 279 with a peak> 100 MeV flux of∼ 3.6× 10− 5 photons cm− 2 s− 1 …

Optical observations of a sample of 12 γ-ray-bright blazars from four optical data archives—
American Association of Variable Star Observers, Small and Moderate Aperture Research …

We report the results of a multiband observing campaign on the famous blazar 3C 279
conducted during a phase of increased activity from 2013 December to 2014 April, including …

Spinning black holes in the centres of galaxies can release powerful magnetised jets. When
the jets are observed at angles of less than a few degrees to the line-of-sight, they are called …

A high-energy muon neutrino event, IceCube-170922A, was recently discovered in both
spatial and temporal coincidence with a gamma-ray flare of the blazar TXS 0506+ 056. It has …