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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Suzaku discovery of a hard component varying independently of the power-law emission in MCG-6-30-15
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Suzaku discovery of a hard component varying independently of the power-law emission in MCG-6-30-15

机译：朱雀发现MCG-6-30-15中独立于幂律发射而变化的硬组分

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摘要

Focusing on hard X-ray variability, we reanalyzed Suzaku data of the 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 has not yet been identified, it can be modeled as a power-law with a photon index of ～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 ～3.4π. This result implies that the solution of a highly spinning black hole in MCG-6-30-15, obtained byMiniutti et al. (2007, PASJ, 59, S315) using the same Suzaku data as ours, is a model-dependent result.
机译：着眼于硬X射线的可变性，我们重新分析了2006年获得的I型塞弗特星系MCG-6-30-15的Suzaku数据。强度分类光谱和主成分分析一致地揭示了非常硬的成分，其独立于主导的幂律发射。尽管尚未确定该硬组分的确切性质，但可以将其建模为受部分覆盖吸收影响的光子指数约为2的幂律，或建模为具有较大光学深度的热质子化发射。当该组件包含在拟合模型中时，通过调用发射范围位于引力半径≥8倍的轻度加宽的铁线，可以成功重现MCG-6-30-15的时均2.5-55 keV光谱从中心黑洞开始，经过中等反射，覆盖率约为〜3.4π。这个结果暗示了由Miniutti等人获得的MCG-6-30-15中高度旋转的黑洞的解。 （2007，PASJ，59，S315）使用与我们相同的Suzaku数据，是模型相关的结果。

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