揭示Mkr 841中的宽带X射线连续谱和铁线复合体
Unveiling the broad band X-ray continuum and iron line complex in Mkr 841
摘要：
Mkr 841是一个明亮的塞弗特1星系，拥有强烈的软过剩和可变的K $α$铁线。XMM在3个不同时期内观察到总累积曝光时间为$\sim$ 108 ks。本文介绍了一个完整的EPIC-pn数据集的宽带谱分析。我们能够测试两种不同的模型的软过剩，相对论模糊的光电离反射（\r模型）和相对论模糊的电离吸收（\a模型）。连续介质由一个简单的截断幂律模型，我们还添加了一个中性反射。这些观测结果揭示了软过剩和铁线的极端和令人困惑的光谱和时间行为。0.5-3 keV软X射线通量在2001年和2005年之间减少了3倍，并且线形似乎是宽和窄分量的混合物。我们成功地描述了这个复杂的宽带0.5-10 keV的光谱变化使用\r或\a，以适应软过剩。这两种模型即使包括高达200千电子伏的同步BeppoSAX数据，也给出了统计上相当的结果。这两种模式是一致的远程反射的存在下，其特征在于在数据中的一个恒定的狭窄的组件。然而，它们的不同之处在于存在于\r中但在\a中不需要的宽线组分。这项研究还揭示了相对论红移窄铁线的零星存在。
英文摘要：
Mkr 841 is a bright Seyfert 1 galaxy known to harbor a strong soft excess and a variable K$α$ iron line. It has been observed during 3 different periods by XMM for a total cumulated exposure time of $\sim$108 ks. We present in this paper a broad band spectral analysis of the complete EPIC-pn data sets. We were able to test two different models for the soft excess, a relativistically blurred photoionized reflection (\r model) and a relativistically smeared ionized absorption (\a model). The continuum is modeled by a simple cut-off power law and we also add a neutral reflection. These observations reveal the extreme and puzzling spectral and temporal behaviors of the soft excess and iron line. The 0.5-3 keV soft X-ray flux decreases by a factor 3 between 2001 and 2005 and the line shape appears to be a mixture of broad and narrow components. We succeed in describing this complex broad-band 0.5-10 keV spectral variability using either \r or \a to fit the soft excess. Both models give statistically equivalent results even including simultaneous BeppoSAX data up to 200 keV. Both models are consistent with the presence of remote reflection characterized by a constant narrow component in the data. However they differ in the presence of a broad line component present in \r but not needed in \a. This study also reveals the sporadic presence of relativistically redshifted narrow iron lines.
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