摘要
在类似于原星系里的高温等离子体介质中，热传导具有很高的效率。当超新星爆发时，可以存在一个以纯热传导为主的能量传播阶段。本文解析地讨论了能量从持续点状源向外热传播的自模问题，得到成团超新星爆发的热自模解。作为热波传播的力学后果，热波自然地以强激波为终结。作为应用，本文分析了矮星系并合形成大星系这一模型中成团超新星爆发时能量传播的各个阶段。结论是，热传导可传播的距离与星系尺度上能量所需输运的距离是同量级的。
Thermal conduction is very efficient in high temperature plasma of,for examPle,a protogalaxy.When supernovae explode,there may exist a period when pure thermal conduction is the dominant process of energy propagation. We discuss explicitly the self-similar solution of thermal conduction from a point-like steady source. As a hydrodynamic consequence,thermal conduction results naturally in a strong shock wave.As an application,we analyze the energy propagation during collective SN explosions in a merging model of galaxy formation.We conclude that the distance that thermal conduction can influence is of the same order of magnitude as distant as what energy has to be transferred over on a galactic scale.
