The mHz QPO in 1ES 1927+654 has persisted and stabilized at ~2.5 mHz with stable soft lags, no strong harmonic, and repeatable large-amplitude flux patterns, also seen in NuSTAR.
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Optical-MIR lags of 39.1 days and 79.4 days are measured in Mrk 42 and Mrk 493, yielding dust reverberation radii of 0.032 pc and 0.065 pc with R_dust/R_BLR ratios of approximately 6-7.
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New observations of 4U 1323-62 detect 12 bursts, confirm 2.94-hour dips, a 0.9 Hz QPO, and suggest a ~10-year cyclic variation in burst rate.
A review synthesizing Fourier, Lomb-Scargle, wavelet, synchrosqueezed, and EMD methods plus statistical tests for solar/stellar periodicity detection, with synthetic benchmark guidelines.
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Persistence of the Millihertz X-ray Quasi-Periodic Oscillation in the Active Galactic Nucleus 1ES 1927+654
The mHz QPO in 1ES 1927+654 has persisted and stabilized at ~2.5 mHz with stable soft lags, no strong harmonic, and repeatable large-amplitude flux patterns, also seen in NuSTAR.