The death of FR II radio sources and their connection with radio relics
The death of FR II radio sources and their connection with radio relics
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FR II 无线电源的消亡及其与无线电遗迹的联系
DOI：
10.1046/j.1365-8711.2002.05799.x
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发表时间：
2002
影响因子：
4.8
通讯作者：
G. Cotter
中科院分区：
文献类型：
--
作者：
C. Kaiser;G. Cotter
星系团中的射电遗迹源通常被描述为强大射电星系的残余物。在这里，我们开发了一个模型，用于射流停止向叶提供能量后这些遗迹的演化。这包括在射流关闭后，处理相对于其气体环境的超压遗迹。我们还根据各种各样的假设确定了遗迹的无线电发射。我们考虑了相对论性粒子注入波瓣阶段磁场强度的演变。所得的光谱在1ghz左右显示出轻微的陡峭，但避免了任何指数谱截止。模型计算用于拟合七个射电遗迹的观测光谱。所讨论的所有型号的配合质量都非常好。不幸的是，这意味着实际上不可能仅从观测到的射电发射来确定任何重要的源参数。
Radio relic sources in galaxy clusters are often described as the remnants of powerful radio galaxies. Here we develop a model for the evolution of such relics after the jets cease to supply energy to the lobes. This includes the treatment of a relic overpressured with respect to its gaseous surroundings even after the jets switch off. We also determine the radio emission of relics for a large variety of assumptions. We take into account the evolution of the strength of the magnetic field during the phase of relativistic particle injection into the lobes. The resulting spectra show mild steepening at around 1 GHz but avoid any exponential spectral cut-offs. The model calculations are used to fit the observed spectra of seven radio relics. The quality of the fits is excellent for all models discussed. Unfortunately, this implies that it is virtually impossible to determine any of the important source parameters from the observed radio emission alone.