A Cluster Merger and the Origin of the Extended Radio Emission in Abell 3667
A Cluster Merger and the Origin of the Extended Radio Emission in Abell 3667
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阿贝尔 3667 中的星团合并和扩展无线电发射的起源
DOI：
10.1086/307327
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
J. Stone
中科院分区：
文献类型：
--
作者：
K. Roettiger;J. Burns;J. Stone
基于新的三维MHD/ n -体模拟，我们建立了A3667中扩展的陡谱射电源和细长x射线结构的数值模型。对A3667的x射线和光学分析表明，它最近经历了一次子星团合并事件。我们相信在A3667中发现的mpc级射电源也是合并的结果。我们之前的数值模拟表明，合并通常会产生大规模的冲击和湍流，既能放大磁场，又能使相对论性粒子原地再加速。我们的模型表明，这些相距约2.6 h-1100 Mpc的射电结构，实际上是通过大约1 Gyr前发生在天空平面上的轻微离轴合并而偶然联系在一起的，其中一个子星团的总质量相当于主星团的约20%。
We present a numerical model for the extended steep-spectrum radio sources and the elongated X-ray structure in A3667 based on new three-dimensional MHD/N-body simulations. The X-ray and optical analyses of A3667 indicate that it has undergone a recent subcluster merger event. We believe that the Mpc-scale radio sources identified in A3667 are also a consequence of the merger. Our previous numerical simulations show that mergers often produce large-scale shocks and turbulence capable of both magnetic field amplification and in situ reacceleration of relativistic particles. Our model suggests that these radio structures, separated by ~2.6 h-1100 Mpc, are in fact causally linked via a slightly off-axis merger that occurred nearly in the plane of the sky approximately 1 Gyr ago with a subcluster having a total mass equal to ~20% of the primary cluster.