Methods for Analyzing the Light Curves of the Non-Thermal Radiation in Active Galactic Nuclei
Modern astronomy from the Early Universe to exoplanets and black holes（2024）
Special Astrophysical Observatory of the Russian Academy of Sciences
Abstract
We present different methods for analyzing the light curves of active galactic nuclei (AGNs). Based on the example of AGN multiwavelength measurements, features of the following methods are considered: (1) structure functions (SFs)—to search for variability timescales; (2) discrete correlation functions (DCFs)—to search for connections between processes; (3) the Lomb–Scargle (L–S) periodogram—to search for periodicity. We analyze advantages and disadvantages of the methods and discuss their constraints and interpretation.
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