活动星系核Fe K α荧光发射线的康普顿肩
The Compton shoulder of the Fe Kalpha fluorescent emission line in active galactic nuclei
摘要：
我们从Murphy & Yaqoob（2009，MNRAS，397，1549）的环形X射线再处理器模型中Fe Ka发射线康普顿肩特性的蒙特卡罗研究中提出了新的高信噪比结果。该模型全面涵盖了康普顿薄到康普顿厚制度，我们发现，康普顿肩轮廓的各种大于（中心照明）球形和磁盘的几何形状。我们的蒙特卡罗模拟是以足够高的统计精度完成的，对于边缘上的康普顿厚环面的情况，这种统计精度足以揭示一种在球形或圆盘几何形状中不存在的新型康普顿肩。这样的康普顿肩主要是由一个狭窄的后向散射功能在~6.24 keV。我们的研究结果还揭示了康普顿肩的形状（及其幅度相对于Fe K α线核心）的入射X射线连续谱的光谱形状的依赖性。我们还显示了速度加宽对Fe Kalpha线剖面的影响，发现如果速度宽度或仪器分辨率大于~2000 km/s的FWHM，则康普顿肩开始与线芯混合，康普顿肩的特征变得难以分辨。特别是，在~7000 km/s的FWHM下，康普顿肩根本无法分辨，其唯一的特征是混合线剖面中的弱不对称性。因此，CCD X射线探测器不能明确地分辨康普顿肩。我们的结果是免费提供的格式，是适合于直接光谱拟合的连续和线模型的真实数据。
英文摘要：
We present new, high signal-to-noise ratio results from a Monte Carlo study of the properties of the Compton shoulder of the Fe Kalpha emission line in the toroidal X-ray reprocessor model of Murphy & Yaqoob (2009, MNRAS, 397, 1549). The model comprehensively covers the Compton-thin to Compton-thick regimes and we find that the variety of Compton shoulder profiles is greater than that for both (centrally-illuminated) spherical and disk geometries. Our Monte Carlo simulations were done with a statistical accuracy that is high enough to reveal, for the case of an edge-on, Compton-thick torus, a new type of Compton shoulder that is not present in the spherical or disk geometries. Such a Compton shoulder is dominated by a narrow back-scattering feature at ~6.24 keV. Our results also reveal a dependence of the shape of the Compton shoulder (and its magnitude relative to the Fe Kalpha line core) on the spectral shape of the incident X-ray continuum. We also show the effects of velocity broadening on the Fe Kalpha line profile and find that if either the velocity width or instrument resolution is greater than a FWHM of ~2000 km/s, the Compton shoulder begins to become blended with the line core and the characteristic features of the Compton shoulder become harder to resolve. In particular, at a FWHM of ~7000 km/s the Compton shoulder is NOT resolved at all, its only signature being a weak asymmetry in the blended line profile. Thus, CCD X-ray detectors cannot unambiguously resolve the Compton shoulder. Our results are freely available in a format that is suitable for direct spectral-fitting of the continuum and line model to real data.
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