Speaker
Description
The very bright Flat Spectrum Radio Quasar (FSRQ) 3C 279 (z = 0.536) is the first source of this class to be detected at very high energy gamma-rays and is characterised by an abundance of bright multi-wavelength (MWL) flaring events, especially at highest energies, where the amplitude and variability timescales are most extreme. The source is particularly known for its complex spectral variability during its gigantic flaring events, flare-in-flare structures and chaotic multi-band correlation behaviours, with sometimes the appearance of orphan flares, that standard one-zone lepto-hadronic models fail to reproduce. 3C 279 exhibited dramatic changes in the optical polarization, contemporaneous with sharp high-energy gamma-ray and optical flares, that do not seem to be connected with the X-ray radiation of the source, pointing towards the need for multi-zone radiative models. In this work, we present the results of the statistical characterisation of the MWL variability of 3C 279 during such events and its two-zone leptonic modelling.
