Evolution of X-ray cavities

Evolution of X-ray cavities
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X射线腔的演变

DOI:
10.1111/j.1365-2966.2009.14684.x
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发表时间:
2009
影响因子:
4.8
通讯作者:
Scannapieco
Scannapieco
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Brüggen;Scannapieco

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最近广泛的观测表明,活动星系核(AGN)驱动的空腔可能提供能量来源,以平衡在“冷核”星系团中心观测到的冷却。更好地理解这些空腔的物理特性的一个工具是它们观察到的形态演变,这取决于湍流密度场和磁场影响等人们知之甚少的特性。在这里,我们结合了数值模拟,包括亚网格湍流和产生合成x射线观测的软件,以检查在没有磁场的情况下x射线腔的演变。我们的结果揭示了空腔的各向异性尺寸演化,这与简化的分析预测有很大不同。这些差异突出了在研究agn驱动的空腔时必须精确量化的一些关键问题,并有助于解释为什么这些区域的推断能量似乎与它们与星团中心的距离相关。解释x射线观测结果需要详细的效应建模,包括质量夹带、阻力和投影造成的扭曲。目前的限制不允许区分纯流体动力学和磁主导的x射线腔模型。
A wide range of recent observations have shown that active galactic nuclei (AGN) driven cavities may provide the energy source that balances the cooling observed in the centres of ‘cool-core’ galaxy clusters. One tool for better understanding the physics of these cavities is their observed morphological evolution, which is dependent on such poorly understood properties as the turbulent density field and the impact of magnetic fields. Here, we combine numerical simulations that include subgrid turbulence and software that produces synthetic X-ray observations to examine the evolution of X-ray cavities in the absence of magnetic fields. Our results reveal an anisotropic size evolution of the cavities that is dramatically different from simplified, analytical predictions. These differences highlight some of the key issues that must be accurately quantified when studying AGN-driven cavities, and help to explain why the inferredpVenergy in these regions appears to be correlated with their distance from the cluster centre. Interpreting that X-ray observations will require detailed modelling of effects, including mass entrainment, distortion by drag forces and projection. Current limitations do not allow a discrimination between purely hydrodynamic and magnetically dominated models for X-ray cavities.
原子数据的标准格式:APED
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