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arXiv 1107.2599astro-ph.CO
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星系团II中活动星系核磁场的演化和分布。团簇大小和动力学状态的影响

Evolution and Distribution of Magnetic Fields from AGNs in Galaxy Clusters II. The Effects of Cluster Size and Dynamical State

Hao Xu, Hui Li, David C. Collins, Shengtai Li, Michael L. Norman

摘要:

理论和模拟表明,由中心超大质量黑洞提供动力的射电喷流和波瓣产生的磁场可能是星系团中磁场的重要来源。这是一系列研究中的第二篇论文,我们提出了自洽的高分辨率自适应网格细化宇宙磁流体动力学(MHD)模拟,同时遵循星系团的形成和活动星系核(AGN)喷出的磁场的演变。我们研究了12个不同的星系团,其维里质量从1 $\times$ 10 $^{14}$到2 $\times$ 10 $^{15}$ M $_{\odot}$。在这项工作中,我们研究的质量和合并的历史上最终的磁性的影响。我们发现磁场的演化与以前的研究在性质上相似。在大多数团簇中,注入的磁场可以在团簇中传输,并在团簇形成过程中被团簇内介质(ICM)湍流进一步放大,而放大历史和磁场分布依赖于团簇的形成和磁性历史.对于不同的集群,这可能非常不同。这些团簇的总磁能在4 $\times$ 10 $^{57}$和$10^{61}$ erg之间,主要由团簇质量决定,近似与总质量的平方成比例.动力学上较老的弛豫星系团通常在它们的ICM中有更多的磁场。由于没有足够的时间来放大磁场,动态上非常年轻的星系团可能被磁化得很弱。

英文摘要:

Theory and simulations suggest that magnetic fields from radio jets and lobes powered by their central super massive black holes can be an important source of magnetic fields in the galaxy clusters. This is paper II in a series of studies where we present self-consistent high-resolution adaptive mesh refinement cosmological magnetohydrodynamic (MHD) simulations that simultaneously follow the formation of a galaxy cluster and evolution of magnetic fields ejected by an active galactic nucleus (AGN). We studied 12 different galaxy clusters with virial masses ranging from 1 $\times$ 10$^{14}$ to 2 $\times$ 10$^{15}$ M$_{\odot}$. In this work we examine the effects of the mass and merger history on the final magnetic properties. We find that the evolution of magnetic fields is qualitatively similar to those of previous studies. In most clusters, the injected magnetic fields can be transported throughout the cluster and be further amplified by the intra-cluster medium (ICM) turbulence during the cluster formation process with hierarchical mergers, while the amplification history and the magnetic field distribution depend on the cluster formation and magnetism history. This can be very different for different clusters. The total magnetic energies in these clusters are between 4 $\times$ 10$^{57}$ and $10^{61}$ erg, which is mainly decided by the cluster mass, scaling approximately with the square of the total mass. Dynamically older relaxed clusters usually have more magnetic fields in their ICM. The dynamically very young clusters may be magnetized weakly since there is not enough time for magnetic fields to be amplified.

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