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arXiv 1906.05705astro-ph.HE
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AGN动力学的温吸收体诊断

Warm Absorber Diagnostics of AGN Dynamics

T. Kallman, A. Dorodnitsyn

摘要:

吸热体和相关现象是活动星系核(AGN)外流或风的可观测表现之一。暖吸收体是低光度活动星系核中常见的吸收体,它们在观测上得到了广泛的研究,并且可以用简单的唯象模型很好地描述。然而,主要的未决问题仍然存在:驱动机制是什么?什么是密度和几何分布?有多少相关的完全电离的气体?与准相对论性的“超快外流”(UFO)有什么关系?在本文中,我们提出了合成光谱的可观察的性质的温暖吸收流和相关的数量。我们使用从头算动力学模型,即有限差分形式的气体运动方程的解。该模型采用各种似是而非的假设温暖的吸收气体的起源和影响其运动的物理机制。合成光谱作为这些模型的观测测试。通过这种方式,我们探讨了各种方案的暖吸收动力学。我们发现,所观察到的光谱放置一定的要求上的几何分布的温暖的吸收气体,并不是所有的动力学方案是同样成功地产生光谱类似的观察。

英文摘要:

Warm absorbers and related phenomena are one of the observable manifestations of outflows or winds from active galactic nuclei (AGN). Warm absorbers are common in low luminosity AGN, they have been extensively studied observationally, and are well described by simple phenomenological models. However, major open questions remain: What is the driving mechanism? What is the density and geometrical distribution? How much associated fully ionized gas is there? What is the relation to the quasi-relativistic 'ultrafast outflows' (UFOs)? In this paper we present synthetic spectra for the observable properties of warm absorber flows and associated quantities. We use ab initio dynamical models, i.e. solutions of the equations of motion for gas in finite difference form. The models employ various plausible assumptions for the origin of the warm absorber gas and the physical mechanisms affecting its motion. The synthetic spectra are presented as an observational test of these models. In this way we explore various scenarios for warm absorber dynamics. We show that observed spectra place certain requirements on the geometrical distribution of the warm absorber gas, and that not all dynamical scenarios are equally successful at producing spectra similar to what is observed.

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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