Evolution of clouds in radio galaxy cocoons

Evolution of clouds in radio galaxy cocoons
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射电星系茧中云的演化

DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
H. Rottgering
H. Rottgering
中科院分区：
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文献类型：
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作者：
G. Mellema;J. Kurk;H. Rottgering

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本文介绍了一个初始密度为10cm3，温度为104k，大小为200pc的发射线云在被强激波超越时的演化过程的数值研究。先前的简单模型提出，这样的云要么完全被破坏，要么只是体积缩小，而我们的结果显示了一种不同的、更复杂的行为：由于快速冷却，云分裂成许多小而密集的碎片，这些碎片可以存活很长时间。我们表明，这种快速冷却行为是广泛的云和冲击性质的预期。这个过程适用于被射电喷流的茧所超越的发射线云的演化。由此产生的小云团会变得不稳定，并形成恒星。因此，我们的结果为喷流诱导恒星形成的过程提供了理论上的可信度，这是在高红移射电星系中观测到的光学/紫外和射电轴对齐的解释之一。
This letter presents a numerical study of the evolution of an emission line cloud of initial density 10 cm 3 , temper- ature 10 4 K, and size 200 pc, being overtaken by a strong shock wave. Whereas previous simple models proposed that such a cloud would either be completely destroyed, or simply shrink in size, our results show a dierent and more complex behaviour: due to rapid cooling, the cloud breaks up into many small and dense fragments, which can survive for a long time. We show that such rapid cooling behaviour is expected for a wide range of cloud and shock properties. This process applies to the evolution of emission line clouds being overtaken by the cocoon of a radio jet. The resulting small clouds would be Jeans unstable, and form stars. Our results thus give theoretical credibility to the process of jet induced star formation, one of the explanations for the alignment of the optical/UV and radio axis observed in high redshift radio galaxies.