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arXiv 1907.01447astro-ph.HE
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热驱动风作为AGN中暖吸收器的起源

Thermally driven wind as the origin of warm absorbers in AGN

Misaki Mizumoto, Chris Done, Ryota Tomaru, Isaac Edwards

摘要:

温暖的吸收体存在于许多活动星系核(AGN)中,被视为以每秒几百到几千公里的速度流出的轻度电离气体。这些缓慢的速度意味着一个大的发射半径,指向宽线区域和/或环面作为这种材料的起源。热驱动最初被认为是发射这种材料的合理机制,但最近的工作集中在磁风上,将这些缓慢,轻度电离的风与高度电离的超快流出物统一起来。在这里,我们使用最近发展的定量模型热风在黑洞双星系统预测的柱密度,速度和电离状态的活动星系核。热风是敏感的光谱能量分布(SED),所以我们使用现实的模型SED作为质量和质量吸积率的函数变化,成为X射线较弱(因此更多的光盘为主)在更高的爱丁顿比。这些模型使我们能够预测发射半径,速度,柱密度和热风的电离状态以及质量损失率和能量。虽然这些与观察到的一些温暖吸收剂的性质很好地匹配,但数据表明存在额外的风材料,最有可能来自灰尘驱动。

英文摘要:

Warm absorbers are present in many Active Galactic Nuclei (AGN), seen as mildly ionised gas outflowing with velocities of a few hundred to a few thousand kilometres per second. These slow velocities imply a large launch radius, pointing to the broad line region and/or torus as the origin of this material. Thermal driving was originally suggested as a plausible mechanism for launching this material but recent work has focused instead on magnetic winds, unifying these slow, mildly ionised winds with the more highly ionised ultra-fast outflows. Here we use the recently developed quantitative models for thermal winds in black hole binary systems to predict the column density, velocity and ionisation state from AGN. Thermal winds are sensitive to the spectral energy distribution (SED), so we use realistic models for SEDs which change as a function of mass and mass accretion rate, becoming X-ray weaker (and hence more disc dominated) at higher Eddington ratio. These models allow us to predict the launch radius, velocity, column density and ionisation state of thermal winds as well as the mass loss rate and energetics. While these match well to some of the observed properties of warm absorbers, the data point to the presence of additional wind material, most likely from dust driving.

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