标题： 活动星系核吸积盘中的高频震荡 显示英文标题

标题： High frequency oscillations in outbursts of Kerr-metric slim disks

摘要： 我们数值研究了黑洞周围的热不稳定性吸积盘。 我们采用演化粘滞应力方程来替代基于两个MHD模拟结果的标准alpha预设方法。 我们在极限周期爆发状态下的一些运行模型中发现了一种有趣的振荡。 这些振荡出现在内边界附近并径向向外传播。 我们认为它们是由声点不稳定性激发的被困$p$模振荡。 我们直接积分局部辐射冷却通量以构建模仿光度光变曲线。 我们在模仿光变曲线的功率谱中发现了一系列泛音，除了基频谐波之外。 基频谐波的频率非常接近盘的最大圆周频率，基频谐波与泛音的频率比是一个规则的整数序列。 我们建议射线追踪计算的代码在虚拟观测中必须是时间依赖的，并指出利用高频QPO测量黑洞自转的稳健性。 显示英文摘要

摘要： We numerically investigate the thermally unstable accretion disks around black holes. We adopt an evolutionary viscous stress equation to replace the standard alpha-prescription based on the results of two MHD simulations. We find a kind of interesting oscillations on some running models in limit-cycle outburst state. The oscillations arise near the inner boundary and propagate radially outwards. We deem that they are the trapped $p$-mode oscillations excited by sonic-point instability. We directly integrate the local radiation cooling fluxes to construct the mimic bolometric light-curve. We find a series of overtones beside the fundamental harmonic on the power spectra of mimic light-curves. The frequency of the fundamental harmonic is very close to the maximum epicyclic frequency of the disk and the frequency ratio of the fundamental harmonic and overtones is a regular integer series. We suggest that the code for ray-tracing calculation must be time-dependent in virtual observation and point out the robustness of the black hole spin measurement with high frequency QPOs.