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arXiv 0902.0651astro-ph.HEastro-ph.GA
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活动星系核的X射线吸收和反射

X-ray Absorption and Reflection in Active Galactic Nuclei

T. J. Turner, L. Miller

摘要:

X射线光谱学提供了一个机会,研究复杂的混合物的发射和吸收成分的环核区域的活动星系核,并了解吸积过程,燃料AGN和反馈的材料,他们的宿主星系。我们描述的光谱特征,可以研究和审查的X射线光谱和光谱变化的活动星系,集中在最近的钱德拉,XMM-牛顿和朱雀数据本地1型活动星系核的进展。我们描述了吸收的证据,涵盖了广泛的柱密度,电离和动力学,并讨论了越来越多的证据,部分覆盖吸收的数据在能量> 10千电子伏。这样的吸收也可以解释所观察到的X射线光谱曲率和可变性的AGN在较低的能量,并可能是一个重要的因素,在塑造这类源的观察到的属性。考虑自洽模型的本地活动星系核表明,X射线光谱可能包括吸收和反射效应的组合,从材料起源于几个光天的黑洞,以及在更大的规模。这是可能的活动星系核X射线光谱可能会受到强烈影响的存在下,预计在系统中具有高吸积率的盘风外流,我们描述的模型,试图预测通过这种风的辐射转移的影响,并讨论了新的数据来测试和解决这些想法的前景。

英文摘要:

X-ray spectroscopy offers an opportunity to study the complex mixture of emitting and absorbing components in the circumnuclear regions of active galactic nuclei, and to learn about the accretion process that fuels AGN and the feedback of material to their host galaxies. We describe the spectral signatures that may be studied and review the X-ray spectra and spectral variability of active galaxies, concentrating on progress from recent Chandra, XMM-Newton and Suzaku data for local type 1 AGN. We describe the evidence for absorption covering a wide range of column densities, ionization and dynamics, and discuss the growing evidence for partial-covering absorption from data at energies > 10 keV. Such absorption can also explain the observed X-ray spectral curvature and variability in AGN at lower energies and is likely an important factor in shaping the observed properties of this class of source. Consideration of self-consistent models for local AGN indicates that X-ray spectra likely comprise a combination of absorption and reflection effects from material originating within a few light days of the black hole as well as on larger scales. It is likely that AGN X-ray spectra may be strongly affected by the presence of disk-wind outflows that are expected in systems with high accretion rates, and we describe models that attempt to predict the effects of radiative transfer through such winds, and discuss the prospects for new data to test and address these ideas.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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