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arXiv 1602.08402astro-ph.GAastro-ph.HE
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亮Seyfert星系硬X射线谱的综合分析

A comprehensive analysis of the hard X-ray spectra of bright Seyfert galaxies

P. Lubinski, V. Beckmann, L. Gibaud, S. Paltani, I. E. Papadakis, C. Ricci, S. Soldi, M. Türler, R. Walter, A. A. Zdziarski

摘要:

利用INTEGRAL观测到的28个亮Seyfert星系的硬X射线谱,结合XMM-Newton、Suzaku和RXTE的X射线谱进行了分析。这些宽带数据与假设热康普顿化作为主要连续分量的模型拟合。我们测试了几个模型选项,通过拟合的康普顿连续伴随着复杂的吸收和康普顿反射。所使用的大数据集和探索的模型空间都使我们能够准确地确定电子等离子体的平均温度kTe、样品中大多数物体的康普顿参数y和康普顿反射强度R。我们的主要发现是,绝大多数样本(20个对象)的特征是kTe < 100 keV,只有两个对象,我们发现kTe > 200 keV。整个样品的中值kTe为48(-14,+57)keV。y参数的分布是双峰的,具有以约0.8为中心的宽分量和在约1.1处的窄峰。与简单的吸收模型相比,复杂的双吸收体模型改善了对所有数据集的拟合,将康普顿反射的拟合强度降低了约2倍。适度的反射(中值R ~0.32)与康普顿化种子光子通量的高比率一起指向具有与吸积盘良好分离的紧凑硬X射线发射区域的几何形状。我们的结果表明,模板Seyferts光谱用于AGN的人口合成模型,应加以修订。

英文摘要:

Hard X-ray spectra of 28 bright Seyfert galaxies observed with INTEGRAL were analyzed together with the X-ray spectra from XMM-Newton, Suzaku and RXTE. These broad-band data were fitted with a model assuming a thermal Comptonization as a primary continuum component. We tested several model options through a fitting of the Comptonized continuum accompanied by a complex absorption and a Compton reflection. Both the large data set used and the model space explored allowed us to accurately determine a mean temperature kTe of the electron plasma, the Compton parameter y and the Compton reflection strength R for the majority of objects in the sample. Our main finding is that a vast majority of the sample (20 objects) is characterized by kTe < 100 keV, and only for two objects we found kTe > 200 keV. The median kTe for entire sample is 48(-14,+57) keV. The distribution of the y parameter is bimodal, with a broad component centered at ~0.8 and a narrow peak at ~1.1. A complex, dual absorber model improved the fit for all data sets, compared to a simple absorption model, reducing the fitted strength of Compton reflection by a factor of about 2. Modest reflection (median R ~0.32) together with a high ratio of Comptonized to seed photon fluxes point towards a geometry with a compact hard X-ray emitting region well separated from the accretion disc. Our results imply that the template Seyferts spectra used in AGN population synthesis models should be revised.

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