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Open AccessArticle

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

Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Insitut für Theoretische Physik IV, Ruhr-Universität Bochum, D-44780 Bochum, Germany
Centre for Space Research, North-West University, Potchefstroom 2520, South Africa
Landessternwarte, Universität Heidelberg, Königstuhl, D-69117 Heidelberg, Germany
Sorbonne Université, Université Paris Diderot, Sorbonne Paris Cité, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies, LPNHE, 4 Place Jussieu, F-75252 Paris, France
Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Krakow, Poland
Author to whom correspondence should be addressed.
Galaxies 2019, 7(1), 34;
Received: 11 January 2019 / Revised: 11 February 2019 / Accepted: 14 February 2019 / Published: 28 February 2019
(This article belongs to the Special Issue Monitoring the Non-Thermal Universe)
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. View Full-Text
Keywords: active galactic nuclei; blazar variability; blazar modeling; multi-wavelength active galactic nuclei; blazar variability; blazar modeling; multi-wavelength
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Zacharias, M.; Böttcher, M.; Jankowsky, F.; Lenain, J.-P.; Wagner, S.J.; Wierzcholska, A. The Long-Lasting Activity in the Flat Spectrum Radio Quasar (FSRQ) CTA 102. Galaxies 2019, 7, 34.

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