刚体自转在巨分子云的聚合形成中的作用

Effect of Rigid Rotation in the Aggregation Formation of Giant Molecular Clouds

分析在聚合形成机制下，巨分子云在刚体自转盘中的形成过程．研究结果表明，形成的巨分子云主要由其附近的分子云组成．由于速度弥散的作用，非弹性碰撞和自引力使分子云聚会在一起，以这种方式形成的巨分子云是小质量的．如果较差自转存在，这些小质量的巨分子云便有更多的机会聚合在一起形成更大质量的巨分子云．这进一步说明，较差自转在巨分子云的形成中起了很大的积极作用．

The formation of giant molecular clouds (GMCs) by aggregation in a rigidly rotating disk galaxy is studied. The result shows that the GMCs so formed consist mainly of individual clouds located close to one another from inelastic collision and self-gravitation under a velocity dispersion. The clouds so formed are not very massive. If a differential rotation exists, then these GMCs have a greater chance of aggregating and forming more massive GMCs, thus indicating the role of differential rotation in the formation of GMCs.