2025MNRAS.543.2880P

The quest to uncover periodic patterns within the $\gamma$-ray emissions of jetted active galactic nuclei (AGNs) has recently emerged as a focal point in astrophysics. One of the primary challenges has been the necessity for prolonged exposures in the $\gamma$-ray energy band. In our investigation, we leverage 12 yr's worth of observations from the Fermi-LAT to systematically explore periodicity across 1492 jetted AGNs catalogued in 4FGL, representing the largest sample analysed to date. Our analysis involves a robust pipeline employing nine distinct techniques designed to detect potential periodic emissions within their $\gamma$-rays. We note that 24 objects with previous hints of periodicity are deliberately excluded in this work since they were reanalysed in a dedicated paper using a similar methodology. Using this thorough approach, we do not find any evidence for periodic signals in the 1492 jetted AGNs $\gamma$-ray light curves analysed here.