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arXiv 0904.3099astro-ph.HEastro-ph.CO
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对MCG-6-30-15 X射线光谱吸收主导模型的限制

Constraints on the absorption-dominated model for the X-ray spectrum of MCG-6-30-15

Christopher S. Reynolds, Andrew C. Fabian, Laura W. Brenneman, Giovanni Miniutti, Phil Uttley, Luigi C. Gallo

摘要:

在附近的塞弗特1.2星系MCG-6-30-15的X射线光谱中的复杂性通常被解释为一条宽的铁线和相关的康普顿反射峰,这些铁线和康普顿反射峰来自快速旋转的黑洞周围的吸积盘的最里面的相对论区域。然而,最近提出了一种替代模型,其中这些光谱特征完全由复杂的(电离和部分覆盖)吸收引起。通过考虑必须伴随光电吸收的荧光发射,我们表明,吸收占主导地位的模型过度预测的6.4千电子伏的铁线通量,除非边缘康普顿厚的吸收体负责硬X射线驼峰满足非常严格的几何约束。在没有一个具体的模型,既遵守这些几何约束,是物理上合理的,相对论反射模型是有利的。

英文摘要:

Complexities in the X-ray spectrum of the nearby Seyfert 1.2 galaxy MCG-6-30-15 are commonly interpreted in terms of a broad iron line and the associated Compton reflection hump from the innermost relativistic regions of an accretion disk around a rapidly spinning black hole. However, an alternative model has recently been proposed in which these spectral features are caused entirely by complex (ionized and partial-covering) absorption. By considering the fluorescent emission that must accompany photoelectric absorption, we show that the absorption-dominated model over-predicts the 6.4keV iron line flux unless the marginally Compton-thick absorber responsible for the hard X-ray hump satisfies very restrictive geometric constraints. In the absence of a specific model that both obeys these geometrical constraints and is physically-plausible, the relativistic-reflection model is favoured.

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