黑洞系统准周期振荡辐射分量的确定
Identifying the radiative components responsible for Quasi-Periodic Oscillations of black hole systems
摘要：
虽然在银河系黑洞系统中观察到的变化的动力学起源，如准周期振荡（QPO），仍然是一个有争议的问题，洞察负责这种行为的辐射成分可以通过研究它们的能量依赖的时间行为。特别地，需要确定最佳拟合的时间平均谱分量的参数的哪些变化再现所观察到的能量相关的分数均方根和时滞。然而，为了获得有意义的解释，标准光谱分量参数必须被重新铸造为物理相关的参数。然后，需要预测它们的波动将导致的能量依赖性时间变化，并与观测结果进行比较。在这项工作中，我们描述了一个通用的方法来做到这一点，并应用该技术的~ 3-4 Hz的QPOs观察到的黑洞系统GRS 1915+105观察到的AstroSat的时间平均光谱可以表示从一个截断盘和热Comptonizing冠在内部区域的发射。我们发现，QPO和他们的谐波可以解释相关的本地吸积率的变化在磁盘，截断盘半径，光学深度和加热速率的日冕与它们之间的时间延迟。我们强调这种技术的潜力，解开负责变异使用高品质的光谱和时间数据AstroSat和NICER的辐射过程。
英文摘要：
While the dynamical origin of the variability observed in Galactic Black hole systems, such as quasi-periodic oscillations (QPOs), are still a matter of debate, insight into the radiative components responsible for such behaviour can be obtained by studying their energy dependent temporal behaviour. In particular, one needs to ascertain which variations of the parameters of the best fit time-averaged spectral components reproduce the observed energy dependent fractional r.m.s and time-lags. However, to obtain meaningful interpretation, the standard spectral component parameters have to be recast to physically relevant ones. Then, the energy dependent temporal variations that their fluctuations will cause, needs to be predicted and compared with observations. In this work, we describe a generic method to do this and apply the technique to the ~ 3-4 Hz QPOs observed in the black hole system GRS 1915+105 as observed by AstroSat where the time-averaged spectra can be represented by emission from a truncated disk and a hot thermal Comptonizing coronae in the inner regions. We find that the QPOs and their harmonic can be explained in terms of correlated local accretion rate variations in the disk, the truncated disk radius, the optical depth and the heating rate of the coronae with time-delays between them. We highlight the potential of such techniques to unravel the radiative process responsible for variability using high quality spectral and temporal data from AstroSat and NICER.
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