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arXiv 1603.03434astro-ph.HE
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用Suzaku卫星对Seyfert 1星系的相对论Fe K α线研究

Relativistic Fe K alpha line study in Seyfert 1 galaxies observed with Suzaku

Giulia Mantovani, Kirpal Nandra, Gabriele Ponti

摘要:

我们提出了一个样本的Seyfert 1星系与朱雀观测的分析。这项工作的目的是严格审查这些活动星系核的X射线谱中的相对论性Fe K α线的证据。样本是从那些至少有一个XMM-牛顿观测中缺少相对论分量的来源中汇编而成的。我们分析了这些天体的朱雀光谱,以便对高能发射(包括康普顿反射峰)有更多的约束。结果表明,在所有观测到的高信噪比源(例如,5-7 keV能带中的计数> 4 x 10^4)中,都能检测到相对论性Fe K α线(置信度>95%)。这与相对论性谱线是塞弗特星系光谱中普遍存在的特征的观点是一致的,但如果没有非常高质量的数据,通常很难检测到。我们还研究了Fe K α线与高能反射连续谱之间的关系。对于大多数样品,反射分量的强度与线的强度一致。然而,在这两种意义上都有例外,即反射连续体很强但线发射很弱,反之亦然。这些观测结果对标准反射模型提出了挑战。

英文摘要:

We present an analysis of a sample of Seyfert 1 galaxies observed with Suzaku. The aim of this work is to examine critically the evidence for a relativistic Fe K alpha line in the X-ray spectra of these AGN. The sample was compiled from those sources in which a relativistic component was missing in at least one XMM-Newton observation. We analysed the Suzaku spectra of these objects in order to have more constraints on the high energy emission, including the Compton reflection hump. The results show that the relativistic Fe K alpha line is detected (at >95% confidence) in all sources observed with high signal-to-noise ratio (e.g. where the counts in the 5-7 keV energy band are > 4 x 10^4). This is in agreement with the idea that relativistic lines are a ubiquitous feature in the spectra of Seyfert galaxies, but are often difficult to detect without very high quality data. We also investigate the relation between the Fe K alpha line and the reflection continuum at high energies. For most of the sample, the strength of the reflection component is consistent with that of the line. There are exceptions in both senses, however i.e. where the reflection continuum is strong but with weak line emission, and vice versa. These observations present a challenge for standard reflection models.

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