Evolution of vorticity and enstrophy in the intracluster medium

Evolution of vorticity and enstrophy in the intracluster medium
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簇内介质中涡度和熵的演化

DOI:
10.1093/mnras/stx1769
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发表时间:
2017
影响因子:
4.8
通讯作者:
Brüggen
Brüggen
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Wittor;Brüggen

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在构造形成过程中,大尺度运动产生的湍流影响了团内介质热组分和非热组分的演化。由于涡度拟能是涡度大小的量度,本文通过分析涡度拟能的拉格朗日历史来研究湍流的产生和演化。为此,我们将联合收割机宇宙学模拟与我们的拉格朗日后处理工具CRaTer的theenzocode。这样,我们就能够量化星系团吸积过程中的涡度拟能源项。在这里,我们集中在红移范围从z = 1到z = 0。最后,我们测量了湍流的耗散率,并估计了由此产生的集群内磁场的放大。我们发现,压缩和斜压运动是涡度拟能的主要来源,而拉伸运动和耗散影响了随后的涡度拟能演变。湍流耗散率能够维持团内磁场放大到观测水平。
Turbulence generated by large-scale motions during structure formation affects the evolution of the thermal and non-thermal components of the intracluster medium. As enstrophy is a measure of the magnitude of vorticity, we study the generation and evolution of turbulence by analysing the Lagrangian history of enstrophy. For this purpose, we combine cosmological simulations carried out with theenzocode with our Lagrangian post-processing tool CRaTer. This way we are able to quantify the individual source terms of enstrophy in the course of the accretion of groups on to galaxy clusters. Here, we focus on the redshift range fromz= 1 toz= 0. Finally, we measure the rate of dissipation of turbulence and estimate the resulting amplification of intracluster magnetic fields. We find that compressive and baroclinic motions are the main sources of enstrophy, while stretching motions and dissipation affect most of the ensuing enstrophy evolution. The rate of turbulent dissipation is able to sustain the amplification of intracluster magnetic fields to observed levels.
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