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arXiv 1602.04284astro-ph.HE
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Seyfert星系宽铁线特征和软X射线变化的成因

Origin of the Broad Iron Line Feature and the Soft X-ray Variation in Seyfert Galaxies

Naoki Iso, Ken Ebisawa, Hiroaki Sameshima, Misaki Mizumoto, Takehiro Miyakawa, Hajime Inoue, Hiroki Yamasaki

摘要:

已知许多塞弗特星系都表现出显著的X射线光谱变化和看似宽的铁K发射线特征。在本文中,我们证明了已为MCG-6.30-15(Miyakawa、Ebisawa & Inoue 2012)和1H0707.495(Mizumoto、Ebisawa & Sameshima 2014)成功提出的“可变部分覆盖模型”也可以解释2-10 keV的光谱变化以及朱雀观测到的其他20个塞弗特星系的宽铁线特征。在这个模型中,通过光学厚吸收云的吸收光谱分量具有显著的铁K边,这主要解释了观测到的看似宽的铁线特征。在扩展X射线源的视线中的吸收云的波动导致部分覆盖分数的变化,这导致直接(未覆盖)光谱分量和吸收(覆盖)光谱分量之间的反相关低于~10 keV。观测到的2-10 keV的光谱在小于~天的时间尺度内的变化主要是由部分覆盖率的这种变化来解释的,而本征软X射线光度几乎是不变的。

英文摘要:

Many Seyfert galaxies are known to exhibit significant X-ray spectral variations and seemingly broad iron K-emission line features. In this paper, we show that the "variable partial covering model", which has been successfully proposed for MCG-6.30-15 (Miyakawa, Ebisawa & Inoue 2012) and 1H0707.495 (Mizumoto, Ebisawa & Sameshima 2014), can also explain the spectral variations in 2-10 keV as well as the broad iron line features in 20 other Seyfert galaxies observed with Suzaku. In this model, the absorbed spectral component through the optically-thick absorbing clouds has a significant iron K-edge, which primarily accounts for the observed seemingly broad iron line feature. Fluctuation of the absorbing clouds in the line of sight of the extended X-ray source results in variation of the partial covering fraction, which causes an anti-correlation between the direct (not covered) spectral component and the absorbed (covered) spectral component below ~10 keV. Observed spectral variation in 2-10 keV in a timescale of less than ~day is primarily explained by such variations of the partial covering fraction, while the intrinsic soft X-ray luminosity is hardly variable.

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