AI 中文总结
该研究利用AstroSat观测黑洞候选体IGR J17091-3624在2022年爆发初期情况，通过大面积X射线正比计数器研究C型QPO演化等，为内吸积流几何结构演化提供重要见解。
AI 中文摘要
我们利用约3天的AstroSat观测，展示了黑洞X射线双星IGR J17091-3624在2022年爆发初始阶段快速X射线定时变化的演化。利用大面积X射线正比计数器的高时间分辨率能力，我们对整个观测期间C型准周期振荡（QPO）的演化进行了全面研究。QPO质心频率从3.30 Hz演化到7.78 Hz，伴随着宽带噪声特征。我们进一步研究了分数均方根变化率和时间滞后的能量依赖性，发现分数均方根呈现正能量依赖性，其幅度在整个观测过程中演化，而时间滞后呈现软滞后行为并随QPO频率演化。这些发现为IGR J17091-3624在2022年爆发开始阶段内吸积流几何结构的演化提供了重要见解。
英文摘要
We present the evolution of rapid X-ray timing variability in the black hole X-ray binary IGR J17091-3624 during the initial phase of its 2022 outburst using a ~3-day-long AstroSat observation. Utilizing the high time-resolution capability of the Large Area X-ray Proportional Counter, we perform a comprehensive study of the evolution of Type-C quasi-periodic oscillations (QPOs) throughout the observation. The QPO centroid frequency evolves from 3.30 to 7.78 Hz, accompanied by the broad-band noise characteristics. We further investigate the energy dependence of the fractional rms variability and time lags, finding that the fractional rms exhibits a positive energy dependence, with its amplitude evolving throughout the observation, while the time lags exhibit the soft-lag behavior and evolve with QPO frequency. These findings provide important insights into the evolution of geometry of the inner accretion flow during the onset phase of the 2022 outburst of IGR J17091-3624.
CommentsThe manuscript is submitted to the proceedings of the International Conference on Innovative Research in Science, Engineering & Social Sciences 2026, School of Basic and Applied Sciences, The Assam Kaziranga University. Comments are welcome. 14 pages 6 figures
