团簇内导电介质的准稳态双折射
Quasisteady Configurations of Conductive Intracluster Media
摘要：
冷核星系团的温度、密度和气体熵的径向分布趋于相似，表明它们已经进入准稳态。如果这种状态是由来自活动星系核中心的热传导和反馈的组合来调节的，那么这些径向剖面的特征应该包含活动星系核热输入的空间分布和热传导的相对重要性的信息。本文针对这些问题，推导出稳态解的集群中，辐射冷却，电子热传导，并通过吸积燃料的热反馈都存在，目的是解释冷核心集群的稳态模型的配置。它发现，许多冷核团簇的核心配置的熵水平略低于那些导电平衡的解决方案，其中磁场抑制电子热传导到1/3的完整斯皮策值，这表明AGN反馈时，传导不能再补偿辐射冷却被触发。甚至当反馈是必要的加热中央~30千秒差距，传导可能仍然是最重要的加热机制内的一个集群的中央~100千秒差距。
英文摘要：
The radial distributions of temperature, density, and gas entropy among cool-core clusters tend to be quite similar, suggesting that they have entered a quasi-steady state. If that state is regulated by a combination of thermal conduction and feedback from a central AGN, then the characteristics of those radial profiles ought to contain information about the spatial distribution of AGN heat input and the relative importance of thermal conduction. This paper addresses those topics by deriving steady-state solutions for clusters in which radiative cooling, electron thermal conduction, and thermal feedback fueled by accretion are all present, with the aim of interpreting the configurations of cool-core clusters in terms of steady-state models. It finds that the core configurations of many cool-core clusters have entropy levels just below those of conductively balanced solutions in which magnetic fields have suppressed electron thermal conduction to ~1/3 of the full Spitzer value, suggesting that AGN feedback is triggered when conduction can no longer compensate for radiative cooling. And even when feedback is necessary to heat the central ~30 kpc, conduction may still be the most important heating mechanism within a cluster's central ~100 kpc.
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