The Long-Lasting Activity in the Flat Spectrum Radio Quasar (FSRQ) CTA~102

Abstract

The flat spectrum radio quasar CTA 102 ($z=1.032$) went through a tremendous phase of variability. Since early 2016 the gamma-ray flux level has been significantly higher than in previous years. It was topped by a four month long giant outburst, where peak fluxes were more than 100 times higher than the quiescence level. Similar trends are observable in optical and X-ray energies. We have explained the giant outburst as the ablation of a gas cloud by the relativistic jet that injects additional matter into the jet and can self-consistently explain the long-term light curve. Here, we argue that the cloud responsible for the giant outburst is part of a larger system that collides with the jet and is responsible for the years-long activity in CTA 102.

arXiv comment9 pages, 5 figures, accepted by Galaxies as part of the special issue "Monitoring the non-thermal Universe", a conference held in Cochem, Germany, 17th - 21st September 2018

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