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arXiv 1006.3449astro-ph.HE
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AGN吸积盘外流III X射线谱的多维模拟:应用于流体动力学模拟

Multi-dimensional modelling of X-ray spectra for AGN accretion-disk outflows III: application to a hydrodynamical simulation

S. A. Sim, D. Proga, L. Miller, K. S. Long, T. J. Turner

摘要:

我们进行多维辐射转移模拟计算光谱的流体动力学模拟的线驱动吸积盘风从活动星系核。合成光谱证实了参数化模型的预期,即盘风可以留下各种各样的光谱特征,包括窄吸收线,宽发射线和康普顿峰。这些特征的形成是复杂的,其贡献来自流体动力学模拟中存在的许多不同结构。特别是,光谱特征的形状都是由气体在一个成功推出的外流,并在复杂的流动中,材料被解除出磁盘平面,但最终回落。我们还证实,强Fe K α线可以开发一个弱的,红色的斜线翼作为康普顿散射的结果在外流。此外,我们还证明了X射线辐射在气流中的散射和再处理在光谱形成和确定风中的电离条件方面具有关键作用。我们发现,散射辐射是相当有效的电离气体,这是从中心源的直接辐射屏蔽。这种效应可能使成功发射大规模盘风更具挑战性,应在未来的风模拟中加以考虑。

英文摘要:

We perform multi-dimensional radiative transfer simulations to compute spectra for a hydrodynamical simulation of a line-driven accretion disk wind from an active galactic nucleus. The synthetic spectra confirm expectations from parameterized models that a disk wind can imprint a wide variety of spectroscopic signatures including narrow absorption lines, broad emission lines and a Compton hump. The formation of these features is complex with contributions originating from many of the different structures present in the hydrodynamical simulation. In particular, spectral features are shaped both by gas in a successfully launched outflow and in complex flows where material is lifted out of the disk plane but ultimately falls back. We also confirm that the strong Fe Kalpha line can develop a weak, red-skewed line wing as a result of Compton scattering in the outflow. In addition, we demonstrate that X-ray radiation scattered and reprocessed in the flow has a pivotal part in both the spectrum formation and determining the ionization conditions in the wind. We find that scattered radiation is rather effective in ionizing gas which is shielded from direct irradiation from the central source. This effect likely makes the successful launching of a massive disk wind somewhat more challenging and should be considered in future wind simulations.

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