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 …

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 …

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 …

Aims. Amongst more than fifty blazars detected in very high energy (VHE, E> 100 GeV) γ
rays, only three belong to the subclass of flat spectrum radio quasars (FSRQs). The …

Locating the gamma-ray emission sites in blazar jets is a long standing and highly
controversial issue. We jointly investigate several constraints on the distance scale r and …

We present the results of variability power spectral density (PSD) analysis using
multiwavelength radio to GeV γ-ray light curves covering timescales of decades/years to …

The inner regions of active galaxies host the most extreme and energetic phenomena in the
universe including, relativistic jets, supermassive black hole binaries, and recoiling …

I present a study of the high-energy γ-ray properties of the flat spectrum radio quasar, PKS
1510− 089, based on 3.75 yr of observations with the Large Area Telescope detector on …

The flat-spectrum radio quasar CTA 102 experienced a prolonged state of enhanced activity
across the entire observed electromagnetic spectrum during 2016–2017, most pronounced …

The flat spectrum radio quasar (FSRQ) PKS 1510− 089 is known for its complex
multiwavelength behaviour and it is one of only a few FSRQs detected in very-high-energy …