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Open AccessArticle

Characterising the Long-Term Variability of Blazars in Leptonic Models

Centre for Space Research, North-West University, Potchefstroom 2520, South Africa
Insitut für theoretische Physik IV, Ruhr-Universität Bochum, D-44780 Bochum, Germany
Author to whom correspondence should be addressed.
Galaxies 2019, 7(1), 35;
Received: 18 January 2019 / Revised: 22 February 2019 / Accepted: 28 February 2019 / Published: 5 March 2019
(This article belongs to the Special Issue Monitoring the Non-Thermal Universe)
PDF [598 KB, uploaded 5 March 2019]


Most research on blazar variability focuses on individual flares to explain acceleration and radiation mechanisms and improve on current models. These short-time events (being minutes, hours, or days) might not be representative of the underlying mechanisms causing small-amplitude variability and/or continuous emission which is present most of the time. We will therefore investigate long-term (months to years) variability of blazar emission in the framework of current leptonic blazar models. For this purpose, we introduce generated time-dependent parameter variations which are based on typical Power Spectral Densities (PSDs) associated with the variability of accretion flows. The PSDs from the resulting light curves are analyzed and compared to one another, as well as the PSD of the input variation. Correlations between light curves are also investigated to aid identification of characteristic variation patterns associated with leptonic models. View Full-Text
Keywords: active galactic nuclei; blazar variability; multi-wavelength; blazar modeling; time series analysis active galactic nuclei; blazar variability; multi-wavelength; blazar modeling; time series analysis

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Thiersen, H.; Zacharias, M.; Böttcher, M. Characterising the Long-Term Variability of Blazars in Leptonic Models. Galaxies 2019, 7, 35.

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