This review provides an overview of recent advances in multi-wavelength and multi-
messenger observations of blazars, the current status of theoretical models for blazar …

This article reviews the recent observational results regarding γ-ray emission from active
galaxies. The most numerous discrete extragalactic γ-ray sources are AGNs dominated by …

A black hole can launch a powerful relativistic jet after it tidally disrupts a star. If this jet
fortuitously aligns with our line of sight, the overall brightness is Doppler boosted by several …

Recently we have shown that high-energy neutrinos above 200 TeV detected by IceCube
are produced within several parsecs in the central regions of radio-bright blazars, that is …

Magnetic reconnection in relativistic collisionless plasmas can accelerate particles and
power high-energy emission in various astrophysical systems. Whereas most previous …

Shock waves, as shown by simulations and observations, can generate high levels of
downstream vortical turbulence, including magnetic islands. We consider a combination of …

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 …

3C 279 is an archetypal blazar with a prominent radio jet that show broadband flux density
variability across the entire electromagnetic spectrum. We use an ultra-high angular …

Supermassive black holes at the centre of active galactic nuclei power some of the most
luminous objects in the Universe. Typically, very-long-baseline interferometric observations …

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 …