Energy dependence of the low-frequency quasi-periodic oscillations in Swift J1727.8-1613
arxiv(2024)
摘要
Based on observations from the Insight-Hard X-ray Modulation Telescope
(Insight-HXMT), an analysis of Type-C quasi-periodic oscillations (QPOs)
observed during the outburst of the new black hole candidate Swift J1727.8-1613
in 2023 was conducted. This analysis scrutinized the QPO's evolution throughout
the outburst, particularly noting its rapid frequency escalation during two
flare events. Utilizing the energy range covered by Insight-HXMT, a dependency
of the QPO frequency on energy was observed. Below approximately 3 Hz, minimal
variations in frequency with energy were noted, whereas clear variations with
photon energy were observed when it exceeded approximately 3 Hz. Additionally,
a sharp drop in the rate of change was observed when the frequency exceeded
approximately 8 Hz. This behavior, similar to several previously reported
sources, suggests the presence of a common underlying physical mechanism.
Moreover, the QPO rms-frequency relationship can be explained by the
Lense-Thirring precession model. The relationship between rms-energy and phase
lag with frequency suggests the black hole system as a high-inclination source.
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