球状星团致密度及其演化

Concentration of Globular Clusters and Its Evolution

根据球状星团动力学演化理论,本文探讨了球状星团致密度的演化与球状星用质量和位置的关系。结果表明,银心距和球状星团质量都与致密度的演化紧密相关。一般来说,银心距很大时致密度演化极少,球状星团质量愈大致密度演化愈缓慢。对现有球状星团致密度的分布作了统计研究,结果表明,在银心距较小的区域,致密度的分布与理论分析结果一致。在大银心距处发现,质量不同的球状星团其致密度分布有明显不同,它可能反映了球状星团形成阶段其致密度与质量紧密相关。

Using dynamical evolution theory of globular clusters (GC), we analyse the changing rate of GC concentration. It shows that the changing rate of GC concentration is tightly related with GC's mass and position. The globular clusters far from the Galaxy center have changed very little since their birth. And the more massive the GC is, the more slowly it evolves.The statistical study of 120 GC observations has been carried out. The concentration distribution of GCs which are not far from the Galaxy center can be reasonably explained by the dynamical evolution model. And, for the GCs far from the Galactic center, their concentration distribution is tightly related to their masses. It seems to show that even in the GC formation process, their mass and their concentration are tightly related. The more massive the GC is, the more concentrated it forms.