GX 339-4体系软硬态跃迁的光谱性质
Spectral properties of transitions between soft and hard state in GX 339-4
摘要：
本文研究了GX 339-4分子在态跃迁过程中的光谱性质。数据取自2010年GX 339-4的爆发，该爆发被Rossi X射线定时探测器密集覆盖，提供了低/硬状态和高/软状态之间的状态转换的良好覆盖。我们选择在软中间状态（SIMS）期间在一定硬度比范围内的所有观察结果。选择该样本的方式包括所有显示B类准周期振荡（QPO）的观测。此外，我们还研究了硬中间态观测的谱。从10至40 keV范围内的正比计数器阵列数据获得的光谱符合幂律，如果需要，还可采用额外的高能截止值。我们发现，光谱是显着更难在SIMS的软到硬的过渡比他们在硬到软的过渡。这表明，在软到硬转变的SIMS期间，与硬到软转变相比，不仅B型QPO的亮度和峰值频率较低，而且光子指数也较低。因此，B型QPO可以与不同的光谱形状相关联，即使它们出现在相同的硬度下。然而，在每个分支中，仅实现质心频率和光子指数的某些组合。
英文摘要：
We present a study of the spectral properties during state transition of GX 339-4. Data are taken from the 2010 outburst of GX 339-4, which is densely covered by Rossi X-ray Timing Explorer, providing an excellent coverage of the state transitions between the low/hard state and the high/soft state. We select all observations within a certain hardness ratio range during the soft intermediate state (SIMS). This sample was chosen in such a way to comprise all observations that show a type-B quasi-periodic oscillation (QPO). In addition, we also investigate the spectra of hard intermediate state observations. The spectra, obtained from Proportional Counter Array data in the 10 to 40 keV range, are fitted with a power law and an additional high energy cut-off if needed. We find that the spectra are significantly harder during the SIMS of the soft-to-hard transition than they are during the hard-to-soft transition. This demonstrates that during the SIMS of the soft-to-hard transition not only the luminosity and peak frequencies of type-B QPOs are lower, but that also the photon index is lower, compared to the hard-to-soft transition. Hence, type-B QPOs can be associated to a different spectral shape even though they appear at the same hardness. However, in each branch only certain combinations of centroid frequency and photon index are realised.
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