标题： 盘与冕之间的辐射反馈机制引起的准周期振荡 显示英文标题

标题： Quasi-Periodic Oscillations due to radiative feedback mechanism between the disc and corona

摘要： 致密天体系统通过其功率密度谱中的尖峰特征显示出准周期振荡（QPOs）。已知吸积盘中的随机变化会在时间延迟后传播到日冕，并且日冕产生的硬X射线会再次照射到吸积盘上，产生反射光谱特征。在这里，我们表明这两种效应的结合在日冕和吸积盘之间形成一个简单的辐射反馈系统，该系统自然产生观察到的QPO，其主要频率对应于时间延迟的倒数。预期功率谱的解析形式可以与观测到的功率谱进行统计比较。因此，首次使用一个物理模型来描述和拟合AstroSat观测到的黑洞系统MAXI J1535-571和GRS 1915+105的功率谱，包括QPO、其谐波以及宽带成分。 显示英文摘要

摘要： Compact object systems exhibit Quasi-Periodic Oscillations (QPOs) as revealed by peaked features in their power density spectra. It has been known that stochastic variations in the accretion disc will propagate to the corona after a time delay and that the hard X-rays from the corona impinge back on the disc, giving reflection spectral features. Here, we show that the combination of these two effects makes a simple radiative feedback system between the corona and the disc, which naturally produces the observed QPOs whose primary frequency corresponds to the inverse of the time delay. The analytical form of the expected power spectra can be statistically compared with the observed ones. Hence, for the first time, a physical model is used to describe and fit the AstroSat observed power spectra of the black hole systems MAXI J1535-571 and GRS 1915+105, including the QPO, its harmonics, as well as the broadband components.