Spectral and Fourier analyses of X-ray quasi-periodic oscillations in accreting black holes
Spectral and Fourier analyses of X-ray quasi-periodic oscillations in accreting black holes
复制标题
DOI：
10.1111/j.1365-2966.2006.10489.x
复制
发表时间：
2006-03
影响因子：
4.8
通讯作者：
M. Sobolewska;P. Zycki
中科院分区：
文献类型：
--
作者：
M. Sobolewska;P. Zycki
我们研究了一些黑洞X射线双星的准周期振荡（QPO）的能量依赖性。RXTE在接近状态转换的时间段观察所选源，并显示1-10 Hz范围内的QPO。我们已经构建了QPO均方根能谱，它提供的信息，潜在的物理过程导致QPO的产生。这些光谱与时间平均光谱有着有趣的关系。当时间平均谱是软的时，QPO均方根谱比时间平均谱硬，而当时间平均谱是硬的时，QPO均方根谱比时间平均谱软。然后，我们讨论这些观测结果的背景下，简单的光谱变率模型。硬QPO谱可以由康普顿化等离子体的加热速率的准周期调制产生，而软QPO谱则由软光子对冷却速率的调制产生。
We study energy dependencies of quasi-periodic oscillations (QPOs) from a number of black hole X-ray binaries. The selected sources were observed by RXTE at time periods close to state transitions and showed QPOs in the 1–10 Hz range. We have constructed QPO rms energy spectra, which provide information about underlying physical process leading to QPO generation. These spectra show an interesting anticorrelation with the time-averaged spectra. The QPO rms spectra are harder than the time-averaged spectra when the latter are soft, while they are softer than the time-averaged spectra when the latter are hard. We then discuss these observational results in the context of simple spectral variability models. Hard QPO spectra can be produced by quasi-periodic modulations of the heating rate of the Comptonizing plasma, while soft QPO spectra result from modulations of the cooling rate by soft photons.