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.
E., Aigrain, S., & Karastergiou, A
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Multi-mission O-C data on eRO-QPE2 reveal hierarchical super-periods consistent with apsidal precession at a~140 Rg but no robust EMRI solution due to sparse sampling and narrow likelihood peaks.
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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.
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Even a precessing clock is right twice per orbit -- The super-periods of eRO-QPE2 and challenges for quasi-periodic eruption orbital models
Multi-mission O-C data on eRO-QPE2 reveal hierarchical super-periods consistent with apsidal precession at a~140 Rg but no robust EMRI solution due to sparse sampling and narrow likelihood peaks.