黑洞X射线双星XTEJ1550-564的交叉谱模拟：对传播涨落范例的挑战
Cross-spectral modelling of the black hole X-ray binary XTEJ1550-564: challenges to the propagating fluctuations paradigm
摘要：
爆发过程中黑洞X射线双星的时间特性可以用质量吸积率起伏向黑洞传播来模拟。这样的模型预测由于传播延迟引起的能带之间的时间滞后。传播波动模型的首次应用黑洞功率谱显示出良好的协议与数据。事实上，从这些系统中观察到的硬滞后似乎与这一普遍预测一致。我们的PROPFLUC代码允许同时预测功率谱，时间滞后，和作为能量的函数的变化的相干性。这被成功地应用于黑洞MAXIJ 1659 -152的Swift数据，联合拟合两个能带的功率谱和这两个带之间的交叉谱。在目前的工作中，我们试图模拟两个高信噪比的罗西X射线定时探测器（RXTE）观测的黑洞XTE J1550-564。我们发现，这两个观察可以充分解释的模型，即使考虑，除了以前的PROPFLUC版本，不同的传播速度的波动。经过广泛的探索模型扩展，我们初步得出结论，模型预测和数据之间的定量和定性的差异是通用的传播波动范式。这一结果鼓励进一步调查的传播波动模型的基本假设。我们讨论了这些假设，着眼于未来的工作。
英文摘要：
Timing properties of black hole X-ray binaries in outburst can be modeled with mass accretion rate fluctuations propagating towards the black hole. Such models predict time lags between energy bands due to propagation delays. First application of a propagating fluctuations model to black hole power spectra showed good agreement with the data. Indeed, hard lags observed from these systems appear to be in agreement with this generic prediction. Our PROPFLUC code allows to simultaneously predict power spectra, time lags, and coherence of the variability as a function of energy. This was successfully applied to Swift data on the black hole MAXIJ1659-152, fitting jointly the power spectra in two energy bands and the cross-spectrum between these two bands. In the current work, we attempt to to model two high signal to noise Rossi X-ray Timing Explorer (RXTE) observations of the black hole XTE J1550-564. We find that neither observation can be adequately explained by the model even when considering, additionally to previous PROPFLUC versions, different propagation speeds of the fluctuations. After extensive exploration of model extensions, we tentatively conclude that the quantitative and qualitative discrepancy between model predictions and data is generic to the propagating fluctuations paradigm. This result encourages further investigation of the fundamental hypotheses of the propagating fluctuations model. We discuss some of these hypotheses with an eye to future works.
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