Search for Periodicities in High Energy AGNs with a Time Domain Approach

This paper investigates a new methodology to search for periods in light curves of high-energy gamma-ray sources such as active galactic nuclei (AGNs). High-energy light curves have significant stochastic components, making period detection somewhat challenging. In our model, periodic terms, drifts...

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Bibliographic Details
Published in:The Astrophysical journal 2022-07, Vol.934 (1), p.6
Main Authors: Rueda, Héctor, Glicenstein, Jean-François, Brun, François
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astrophysics
BL Lacertae objects
Energy
Gamma ray sources
Gamma rays
Jets
Light curve
Markov chains
Modelling
Noise
Period search
Periodicities
Random walk
Search methods
Time domain analysis
Time series analysis
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Summary:This paper investigates a new methodology to search for periods in light curves of high-energy gamma-ray sources such as active galactic nuclei (AGNs). High-energy light curves have significant stochastic components, making period detection somewhat challenging. In our model, periodic terms, drifts of the light curves, and random walk with a correlation between flux points due to colored noise are taken into account independently. The parameters of the model are obtained directly from a Markov Chain Monte Carlo minimization. The time periods found are compared to the output of the publicly available Agatha program. The search method is applied to high-energy periodic AGN candidates from the Fermi-LAT catalog. The significance of periodic models over pure noise models is discussed. Finally, the variability of the period and amplitude of oscillating terms is studied on the most significant candidates.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac771c