Speaker
Description
We search for TeV quasi-periodic oscillations (QPOs) in the nearby high-synchrotron-peaked blazars Markarian 421 (z = 0.031) and Markarian 501 (z = 0.034) using the LHAASO-WCDA detector. Its high duty cycle and superior sensitivity enable long-term, high-statistical-significance, and continuous monitoring of these sources. Our analysis strategy involves constructing daily binned light curves above 1 TeV, followed by time-series analyses using the Lomb–Scargle periodogram (LSP) and the weighted wavelet Z-transform (WWZ), and combining these with Markov Chain Monte Carlo (MCMC) methods to robustly account for red-noise contamination. Preliminary results from the TeV light curve of Mrk 421 reveal a tentative hint of a quasi-periodic signal with a period of approximately 5.6 days.
