1. Probable low-frequency quasi-periodic oscillations in blazars from the ZTF survey.
- Author
-
Banerjee, Anuvab, Negi, Vibhore, Joshi, Ravi, Kumar, Nagendra, Wiita, Paul J, Chand, Hum, Rawat, Nikita, Wu, Xue-Bing, and Ho, Luis C
- Subjects
LIGHT curves ,OSCILLATIONS ,HELICAL structure ,WAVELETS (Mathematics) ,ACTIVE galaxies - Abstract
We investigate the possible presence of quasi-periodic oscillation (QPO) signals in 2103 blazars from the Zwicky Transient Facility (ZTF) time-domain survey. We detect a low-frequency QPO signal in five blazars observed over these 3.8-yr-long optical r -band ZTF light curves. These periods range from 144 to 196 d detected at ≳4σ significance levels in both the Lomb–Scargle periodogram and weighted wavelet Z-transform analyses. We find consistent results using the phase dispersion minimization technique. A similar peak is detected in the g -band light curves at a slightly lower significance of 3σ. Such nearly periodic signals on these time-scales in optical wavebands most likely originate from a precessing jet with high Lorentz factor, closely aligned to the observer's line of sight or the movement of plasma blobs along a helical structure in the jet. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF