MAXI J1348-630中C型准周期振荡谐波的宽带特性
Broadband Properties of the Harmonic of Type-C Quasi-periodic Oscillation in MAXI J1348-630
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中文总结 AI 辅助
本研究利用Insight-HXMT数据探究MAXI J1348-630的C型QPO谐波，发现其能量依赖特性并提出软硬X射线谐波的不同起源机制。
中文摘要 AI 辅助
谐波是黑洞X射线双星中准周期振荡（QPO）的常见特征，但其物理起源仍知之甚少。利用宽能段的Insight-HXMT数据，我们研究了MAXI J1348-630中的C型QPO谐波。该谐波仅在硬中间态被显著探测到，且表现出明显的能量依赖特性：它在软X射线波段（<10 keV）很强，其分数均方根（rms）振幅甚至超过基频QPO的振幅；而在硬X射线波段（>10 keV）则弱得多，其rms振幅通常比基频低数倍。此外，该谐波在软X射线波段与基频无显著相位耦合，而在硬X射线波段则存在强耦合。这些特征表明该谐波具有复杂的、依赖能量的起源。我们提出，硬X射线谐波可能源于冕内基频波形的非线性畸变，而软X射线谐波则可能通过不同的物理过程产生，例如来自内吸积盘的反射辐射。
英文摘要
Harmonics are common features of quasi-periodic oscillations (QPOs) in black hole X-ray binaries; however, their physical origins remain poorly understood. Using broadband Insight-HXMT data, we investigated the Type-C QPO harmonic in MAXI J1348-630. The harmonic is significantly detected exclusively during the hard intermediate state and displays prominent energy-dependent properties: while it is strong in the soft X-ray band (< 10 keV) with its fractional rms amplitude even exceeding that of the fundamental QPO, it is much weaker in the hard X-ray band (> 10 keV), where its rms amplitude is generally several times lower than that of the fundamental. Furthermore, the harmonic shows no significant phase coupling with the fundamental in the soft X-ray band, whereas strong coupling is present in the hard X-ray band. These features point to a complex, energy-dependent origin for the harmonic. We propose that the hard X-ray harmonic may arise from nonlinear distortion of the fundamental waveform within the corona, while the soft X-ray harmonic is likely produced via a distinct physical process, such as the reflection emission from the inner disk.
