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Peñil, P.; Domínguez, A.; Buson, S.; Ajello, M.; Otero-Santos, J.; Barrio, J. A.; Nemmen, R.; Cutini, S.; Rani, B.; Franckowiak, A.; Cavazzuti, E.
Astrophysical journal/The Astrophysical journal, 06/2020, Volume: 896, Issue: 2Journal Article
We use nine years of γ-ray data provided by the Fermi Large Area Telescope (LAT) to systematically study the light curves (LCs) of more than 2000 active galactic nuclei (AGN) included in recent Fermi-LAT catalogs. Ten different techniques are used, which are organized in an automatic periodicity-search pipeline, in order to search for evidence of periodic emission in γ rays. Understanding the processes behind this puzzling phenomenon will provide a better view about the astrophysical nature of these extragalactic sources. However, the observation of temporal patterns in γ-ray LCs of AGN is still challenging. Despite the fact that there have been efforts to characterize the temporal emission of some individual sources, a systematic search for periodicities by means of a full likelihood analysis applied to large samples of sources was missing. Our analysis finds 11 AGN, of which 9 are identified for the first time, showing periodicity at more than 4 in at least four algorithms. These findings will help in solving questions related to the astrophysical origin of this periodic behavior.
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