Detection of a non-harmonic QPO precursor to Type-B in the HIMS of MAXI J1820+070 using NICER timing data.
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6 Pith papers cite this work. Polarity classification is still indexing.
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astro-ph.HE 6years
2026 6representative citing papers
Type-C QPO amplitudes correlate linearly with jet inclination up to 8 Hz in BH LMXBs, lower on decay than rise, reproducible by precessing hot flow if misalignment ≥10-15°.
First detection of QPOs above 250 keV in Swift J1727.8-1613 with up to 8.9 sigma significance, showing decreasing rms and increasing soft lags that suggest a geometric origin from small-scale jet precession.
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.
Multi-band PCCDs for MAXI J1348-630, MAXI J1820+070 and Swift J1727.8-1613 show general consistency with RXTE hue regions in hard states, some soft-state deviations, energy-band differences, and a non-looping very high state signature.
Comprehensive analysis of AstroSat data shows a sign change in QPO time lags at ~2 Hz for high-inclination sources, consistent with a transition from elongated jet-like to compact corona.
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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.