基于慧眼卫星数据的致密天体高频QPO观测性质研究

致密天体中毫秒级的快速光变现象被称为高频准周期振荡（HFQPO）现象，它既包括中子星X射线双星中的千赫兹QPO（kHz QPO），也包括黑洞X射线双星中的HFQPO。高频QPO的频率与围绕中心致密天体做开普勒运动的物质的动力学时标一致，通常认为它产生于致密天体附近，因此高频QPO的观测研究对于强引力场及致密物质的物理研究具有重要意义。本项目的主要研究内容是利用慧眼卫星Insight-HXMT的观测数据对中子星和黑洞X射线双星中的高频QPO现象进行探索与研究，包括(1)亮中子星kHz QPO观测性质的详细研究，如kHz QPO的中心频率、rms、time lag等，及其观测性质随态和能量的演化关系；(2)中子星kHz QPO辐射能段的确认；(3)黑洞HFQPO的搜索和观测性质研究；(4)通过致密天体高频QPO观测性质及演化关系的统计分析，为高频QPO的产生机制提供观测依据或给出限制。

High-frequency quasi-periodic oscillations (HFQPOs) have been found in both neutron star X-ray binaries (known as kHz QPOs) and black hole X-ray binaries. The high-frequency QPOs have time-scales similar to that of the orbital motion of the innermost region of the accretion disk. So, it is important to study the high-frequency QPOs for understanding the physics of the strong gravitational field and the dense matter. In this project, based on Insight-HXMT data, we propose to investigate the high-frequency QPO phenomenon in NS XRBs and BH XRBs, including (1) to study the detailed properties of kHz QPOs in bright NS XRBs, (2) to determine the emission energy band of kHz QPOs in NS XRBs, (3) to search for the HFQPOs in BH XRBs , (4) to provide constraints on the current models for high-frequency QPOs, through systematic analysis on the properties of the high-frequency QPOs.