Evidence of an interaction between jets and intra-cluster magnetic layer
Evidence of an interaction between jets and intra-cluster magnetic layer
复制标题
喷流与簇内磁性层之间相互作用的证据
DOI：
10.1038/s41586-021-03434-1
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发表时间：
2021
期刊：
影响因子：
64.8
通讯作者：
2021
中科院分区：
文献类型：
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作者：
J. O. Chibueze;H. Sakemi;T. Ohmura;M. Machida;H. Akamatsu;T. Akahori;H. Nakanishi;V. Parekh;R. van Rooyen;T. and T. Takeuchi;2021
众所周知，星系团中蕴藏着磁场，但磁场的性质尚不清楚。星系团Abell3376(红移0.0461)中，在冷而致密的等离子体与热的环境等离子体碰撞形成的密度接触不连续处可以观察到星系团内的磁场，并且这种不连续存在于合并星系团Abell3376(红移0.0461)中第二亮的星系MRC0600-399附近。东西方向的细长X射线发射显示出一种类似彗星的结构，达到兆秒级。之前的射电观测探测到了来自MRC0600-399的弯曲喷流，它们在冲压下沿着与星系团相同的方向移动。在这里，我们报告了MRC 0600-399的射电观测，它们的分辨率和灵敏度分别比以前的结果高3.4倍和11倍。与典型的射流不同，MRC-0600-399在接触不连续处显示了90度的弯曲，并且准直的射流从弯曲点延伸超过100千帕秒。我们看到的是弥漫的、细长的发射，我们称之为“双镰刀”结构。光谱指数在弯曲点下游变平，表明宇宙线再加速。高分辨率数值模拟表明，沿不连续面的有序磁场对射流方向的改变具有重要作用。双镰刀喷射器的形态与模拟结果一致。我们的结果对磁场对成员星系和星系团的星系团内介质演化的影响提供了深入的了解。
Galaxy clusters are known to harbour magnetic fields, the nature of which remains unresolved. Intra-cluster magnetic fields can be observed at the density contact discontinuity formed by cool and dense plasma running into hot ambient plasma,, and the discontinuity exists near the second-brightest galaxy, MRC 0600-399, in the merging galaxy cluster Abell 3376 (redshift 0.0461). Elongated X-ray emission in the east–west direction shows a comet-like structure that reaches the megaparsec scale. Previous radio observations,detected the bent jets from MRC 0600-399, moving in same direction as the sub-cluster, against ram pressure. Here we report radio,observations of MRC 0600-399 that have 3.4 and 11 times higher resolution and sensitivity, respectively, than the previous results. In contrast to typical jets,, MRC 0600-399 shows a 90-degree bend at the contact discontinuity, and the collimated jets extend over 100 kiloparsecs from the point of the bend. We see diffuse, elongated emission that we name ‘double-scythe’ structures. The spectral index flattens downstream of the bend point, indicating cosmic-ray reacceleration. High-resolution numerical simulations reveal that the ordered magnetic field along the discontinuity has an important role in the change of jet direction. The morphology of the double-scythe jets is consistent with the simulations. Our results provide insights into the effect of magnetic fields on the evolution of the member galaxies and intra-cluster medium of galaxy clusters.