First detection of mHz QPOs in 1A 0535+262 below 27 keV with frequencies evolving from 41 to 93 mHz, mostly hard lags, and double-peaked high-energy structure near outburst peak, interpreted as linked to soft-photon source and Comptonizing outflow evolution.
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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.
Discovery of Spearman correlation 0.8 between energy-dependent time lag and polarization degree in Swift J1727.8-1613, with theoretical arguments for additional mechanisms beyond inverse Comptonization.
Type-C QPOs in Swift J1727.8-1613 exhibit energy-dependent rms-frequency relations with a common break at 4 Hz, indicating a change in accretion geometry.
Viscous shock oscillations in transonic flows around spinning black holes yield QPO frequency ranges that broaden with increasing spin and match observations in black hole X-ray binaries.
AstroSat observation of MAXI J1535-571 reveals a tight correlation between QPO centroid frequency (1.7-3.0 Hz) and power-law index Gamma while flux increases linearly.
citing papers explorer
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Unveiling hidden millihertz quasi-periodic oscillations in 1A 0535+262
First detection of mHz QPOs in 1A 0535+262 below 27 keV with frequencies evolving from 41 to 93 mHz, mostly hard lags, and double-peaked high-energy structure near outburst peak, interpreted as linked to soft-photon source and Comptonizing outflow evolution.
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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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Bridging X-ray Polarization with Timing & Spectroscopic Parameters of a galactic black hole: Swift J1727.8-1613
Discovery of Spearman correlation 0.8 between energy-dependent time lag and polarization degree in Swift J1727.8-1613, with theoretical arguments for additional mechanisms beyond inverse Comptonization.
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An Insight-HXMT View of the Evolution of the Type-C Quasiperiodic Oscillation during the Flaring State of Swift J1727.8-1613
Type-C QPOs in Swift J1727.8-1613 exhibit energy-dependent rms-frequency relations with a common break at 4 Hz, indicating a change in accretion geometry.
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QPOs from the Viscous Transonic Accretion Flow Around a Spinning Black Hole
Viscous shock oscillations in transonic flows around spinning black holes yield QPO frequency ranges that broaden with increasing spin and match observations in black hole X-ray binaries.
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Spectro-timing analysis of MAXI J1535-571 using AstroSat
AstroSat observation of MAXI J1535-571 reveals a tight correlation between QPO centroid frequency (1.7-3.0 Hz) and power-law index Gamma while flux increases linearly.