Predictions for Fourier‐resolved X‐ray spectroscopy from the model of magnetic flare avalanches above an accretion disc with hot ionized skin
Predictions for Fourier‐resolved X‐ray spectroscopy from the model of magnetic flare avalanches above an accretion disc with hot ionized skin
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根据具有热电离皮肤的吸积盘上方的磁耀斑雪崩模型对傅立叶分辨 X 射线光谱的预测
DOI：
10.1046/j.1365-8711.2002.05451.x
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发表时间：
2002
影响因子：
4.8
通讯作者：
Piotr T. Z˙ycki
中科院分区：
文献类型：
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作者：
Piotr T. Z˙ycki
将Poutanen & Fabian关于吸积黑洞x射线变异性的磁耀斑雪崩模型与流体静力平衡下照明吸积盘垂直结构的计算相结合。后者预测了由x射线照射等离子体的热不稳定性引起的热电离皮肤的存在。这种电离表面的存在，其特性依赖于圆盘半径，引入了发射的x射线光谱依赖于圆盘上的位置。如果该位置与耀斑的时间尺度有关，则x射线能谱（包括初级连续统和再处理分量）除了耀斑期间光谱演变所产生的傅立叶频率外，还会获得额外的依赖。我们在这个模型中计算了傅里叶频率分辨谱，并证明了热表皮的存在引入了与在黑洞双星中观察到的相反的趋势。此外，如果光谱演化引起的傅立叶频率依赖与观测结果一致，耀斑轮廓受到强烈约束。
The magnetic flare avalanches model of Poutanen & Fabian for X-ray variability of accreting black holes is combined with computations of the vertical structure of illuminated accretion discs in hydrostatic equilibrium. The latter predict the existence of a hot ionized skin, caused by the thermal instability of X-ray-illuminated plasma. The presence of such an ionized skin, with properties dependent on the disc radius, introduces a dependence of the emitted X-ray spectrum on the position on the disc. If the position is related to the time-scale of the flares, the X-ray energy spectra (both the primary continuum and the reprocessed component) gain an additional dependence on the Fourier frequency, beside that resulting from spectral evolution during a flare. We compute the Fourier frequency-resolved spectra in this model and demonstrate that the presence of the hot skin introduces trends opposite to those observed in black hole binaries. Furthermore, the flare profile is strongly constrained, if the Fourier frequency dependence arising from spectral evolution is to agree with observations.