为什么中央射电遗迹如此罕见？
Why are central radio relics so rare?
摘要：
在本文中，我们解决的问题，为什么集群无线电遗迹，连接到冲击加速，所谓的无线电gischt，优先被发现在星系团的郊区。通过在宇宙学网格模拟中识别合并冲击波，我们探索了几种将冲击中耗散的能量与无线电波段中发射的能量联系起来的处方。在距星团中心100-200 kpc范围内，没有一个被调查的模型产生可探测的射电遗迹。所有模型在预计距离> 800千秒差距时都产生> 50%的可探测残留物辐射。由于简单的几何学原因，由沿着视线传播的冲击引起的中央射电遗迹是罕见的事件，它们具有低表面亮度，使它们对当前的仪器难以捕捉。我们的模拟结果表明，所观察到的文物的径向分布可以解释的径向趋势的耗散动能的冲击，增加与集群中心的距离，直到一半的维里半径。
英文摘要：
In this paper we address the question why cluster radio relics that are connected to shock acceleration, so-called radio gischt, have preferentially been found in the outskirts of galaxy clusters. By identifying merger shock waves in cosmological grid simulations, we explore several prescriptions for relating the energy dissipated in shocks to the energy emitted in the radio band. None of the investigated models produce detectable radio relics within 100-200 kpc from the cluster centre. All models cause > 50 per cent of the detectable relic emission at projected distances > 800 kpc. Central radio relics caused by shocks that propagate along the line-of-sight are rare events for simple geometrical reasons, and they have a low surface brightness making them elusive for current instruments. Our simulations show that the radial distribution of observed relics can be explained by the radial trend of dissipated kinetic energy in shocks, that increases with distance from the cluster centre up until half of the virial radius.
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