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基于慧眼卫星观测的准周期振荡现象的研究进展

Research Progress on Quasi-Periodic Oscillations Based on Observations from Insight-HXMT

  • 摘要: X射线双星的光变曲线中普遍存在准周期振荡(Quasi-Periodic Oscillation, QPO)现象, 一般认为QPO来自于距离致密星很近的吸积流, 因此QPO是检验强引力场下的广义相对论效应以及研究致密星附近吸积几何演化的重要探针. 慧眼卫星发射之前, 对QPO的研究主要集中在小于30 keV的能量范围. 慧眼卫星在高能段具有非常大的有效面积, 打开了研究QPO高能性质的窗口. 总结了慧眼卫星在QPO的研究方面取得的进展, 包括高能QPO的观测特征、物理起源以及对应的吸积几何演化等, 并对未来可能的突破方向进行了展望.

     

    Abstract: Quasi-Periodic Oscillations (QPOs) are commonly observed in the light curves of X-ray binaries, and they are believed to originate from the innermost accretion flow around the compact object. Therefore, QPO can serve as a powerful probe for testing the general relativity effects in strong gravitational fields and studying the evolution of the accretion geometry around compact objects. Prior to the launch of Insight-HXMT (Insight Hard X-ray Modulation Telescope), research on QPOs primarily focused on the energy range below 30 keV. With its large effective area in the high-energy range, Insight-HXMT has opened a new window for studying the high-energy properties of QPOs. In this paper, we review the studies of QPOs in X-ray binaries using the Insight-HXMT data, mainly focusing on the high-energy properties of different kinds of QPOs, their physical origin and the evolution of the accretion geometry. We also present our perspectives on the topic.

     

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