Evidence for a bursty ${\hat{I}}^3$-ray QPO in the neutrino-associated FSRQ PKS 1424$-$418 using Fast Template Periodograms and Machine Learning

Aaron A. Maldonado, Alberto Domínguez, Adithiya Dinesh +4

Standard frequency-domain searches for quasi-periodic oscillations (QPOs) in active galactic nuclei generally assume sinusoidal variability. However, ${\hat{I}}^3$-ray blazar emission often…