Abstract Using public data from the Katzman Automatic Imaging Telescope (KAIT) and the Zwicky Transient Facility (ZTF), we constructed an R band light curve dataset spanning over 5000 days for 135 blazars, and investigated their quasi-periodic oscillations (QPOs) via the generalized Lomb-Scargle (GLS) and Weighted Wavelet Z-transform (WWZ) methods. With certain empirical criteria, we detected four blazars, including J0507+6737, J0816-1311, J1015+4926 and J1838+4802 with QPOs beyond 3σ significance. Targets J0816-1311, J1015+4926 and J1838+4802 represent new QPO detections, with their periods ranging from 374 to 2177 days (1.0 ∼ 5.9 years). The WWZ analysis demonstrated periodicity ratios of 2 : 1 for J1015+4926 and J1838+4802, and ratios of 3 : 2 for J0507+6737, J0816-1311 and J1838+4802. The light curves of J0816-1311 and J1015+4926 were well fitted by the double sinusoidal function model. These QPOs may originate from supermassive black hole binaries (SMBHBs), accretion disk instabilities, or jet precession. This work demonstrates the effectiveness of multi-survey datasets in resolving long timescale QPOs, which is crucial for multi-messenger searches for SMBHBs.
Guo et al. (Thu,) studied this question.
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