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

1
Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Insitut für Theoretische Physik IV, Ruhr-Universität Bochum, D-44780 Bochum, Germany
2
Centre for Space Research, North-West University, Potchefstroom 2520, South Africa
3
Landessternwarte, Universität Heidelberg, Königstuhl, D-69117 Heidelberg, Germany
4
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
5
Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342 Krakow, Poland
*
Author to whom correspondence should be addressed.
Galaxies 2019, 7(1), 34; https://doi.org/10.3390/galaxies7010034
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)
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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. 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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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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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