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arXiv 1008.2157astro-ph.HE
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方舟120的软、硬X射线过剩的反射源

A reflection origin for the soft and hard X-ray excess of Ark 120

E. Nardini, A. C. Fabian, R. C. Reis, D. J. Walton

摘要:

在过去的几年里,人们提出了几种模型来解释在第1型活动星系核(AGN)的X射线谱中观测到的广泛存在的软过剩。特别是,从光致电离吸积盘反射相对论效应模糊已被证明是成功的复制的光谱形状和变异模式的许多来源。作为对这种情况的进一步测试,我们分析了最近对Arakelian 120的~100 ks长的朱雀观测,Arakelian 120是一个典型的“裸”塞弗特1星系,预计没有复杂的吸收系统来模仿软过剩或掩盖这个关键组成部分的固有特性。我们表明,反射模型,允许温暖/模糊和冷/遥远的再处理提供了一个自洽的和令人信服的解释的宽带X射线发射的方舟120,还具有结构化的铁功能和高能量驼峰。虽然温暖的吸收体,风/流出和多康普顿化区域可能发挥重要作用,在源具有更高的光谱复杂性,这种情况下,研究增加了证据的存在模糊盘反射的X射线光谱的1型活动星系核的基本组成部分。

英文摘要:

Over the last few years several models have been proposed to interpret the widespread soft excess observed in the X-ray spectra of type 1 active galactic nuclei (AGN). In particular, reflection from the photoionized accretion disc blurred by relativistic effects has proven to be successful in reproducing both the spectral shape and the variability pattern of many sources. As a further test to this scenario we present the analysis of a recent ~100 ks long Suzaku observation of Arakelian 120, a prototypical 'bare' Seyfert 1 galaxy in which no complex absorption system is expected to mimic a soft excess or mask the intrinsic properties of this key component. We show that a reflection model allowing for both warm/blurred and cold/distant reprocessing provides a self-consistent and convincing interpretation of the broadband X-ray emission of Ark 120, also characterized by a structured iron feature and a high-energy hump. Although warm absorbers, winds/outflows and multiple Comptonizing regions may play significant roles in sources with more spectral complexity, this case study adds evidence to the presence of blurred disc reflection as a basic component of the X-ray spectra of type 1 AGN.

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