Suzaku在MCG-6-30-15中发现与幂律发射无关的硬组分
Suzaku Discovery of a Hard Component Varying Independently of the Power-Law Emission in MCG-6-30-15
摘要：
针对硬X射线光变，我们重新分析了2006年获得的I型塞弗特星系MCG-6-30-15的朱雀数据。强度排序的光谱和主成分分析一致地揭示了一个非常硬的组件，独立于占主导地位的幂律发射。虽然这个硬组分的确切性质尚未确定，但它可以被建模为具有光子指数~2的幂律，受部分覆盖吸收的影响，或者作为具有相对大的光学深度的热康普顿化发射。当这个分量被包括在拟合模型中时，MCG-6-30-15的时间平均2.5-55 keV谱可以通过调用一个轻度加宽的铁线（其发射区位于距中心黑洞大于8倍引力半径处）和一个覆盖分数为~3.4的中度反射成功地再现。这一结果意味着，Miniutti等人（2007，PASJ，59，S315）使用相同的朱雀数据获得的MCG-6-30-15中高自旋黑洞的解是一个依赖于模型的结果。
英文摘要：
Focusing on hard X-ray variability, we reanalyzed Suzaku data of Type I Seyfert galaxy MCG-6-30-15 obtained in 2006. Intensity-sorted spectroscopy and a principal component analysis consistently revealed a very hard component that varies independently of the dominant power-law emission. Although the exact nature of this hard component is not yet identified, it can be modeled as a power-law with a photon index ~2 affected by a partial covering absorption, or as a thermal Comptonization emission with a relatively large optical depth. When this component is included in the fitting model, the time-averaged 2.5-55 keV spectrum of MCG-6-30-15 can be reproduced successfully by invoking a mildly broadened iron line with its emission region located at > 8 times the gravitational radii from the central black hole, and a moderate reflection with a covering fraction of ~3.4. This result implies that the solution of a highly spinning black hole in MCG-6-30-15, obtained by Miniutti et al. (2007, PASJ, 59, S315) using the same Suzaku data, is a model dependent result.
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