论文标题
旧恒星簇的动力钟对宿主星系引力场的依赖性
Dependence of the old star clusters' dynamical clock on the host galaxy gravitational field
论文作者
论文摘要
我报告了$ a^+$参数分析的结果，该参数测量了老恒星簇中蓝色Straggler恒星的径向分离水平，这通常称为长期内部动力学演化的动力钟。我使用了文献中有48个银河系的$ a^+$值。我发现$ a^+$的关系以及经过的中央放松时间数量（$ n_ {lesase} $）表明，除了取决于两体放松机制外，对宿主星系重力潜力的强度不可忽略不计。实际上，测得的$ a^+$值对应于相对较小或更大的$ n_ {lassive} $值的星形簇的值，位于较远或更靠近星系中心。从观察的角度来看，这一发现揭示了由于两体弛豫和潮汐效应而导致的动态进化阶段的可能性，这会影响整个星团的身体。
I report outcomes of the analysis of the $A^+$ parameter, which measures the level of radial segregation of blue straggler stars in old star clusters, commonly known as the dynamical clock for the long-term internal dynamical evolution. I used $A^+$ values available in the literature for 48 Milky Way globular clusters. I found that the relationship of $A^+$ and the number of central relaxation times which have elapsed ($N_{relax}$) shows a non negligible dependence on the strength of the host galaxy gravitational potential, in addition to depending on the two-body relaxation mechanism. Indeed, a measured $A^+$ value corresponds to relatively smaller or larger $N_{relax}$ values for star clusters located farther or closer to the galaxy center. From an observational point of view, this finding reveals the possibility of disentangling for the first time the dynamical evolutionary stage due to two-body relaxation and tidal effect, that affect the whole star clusters' body concurrently.
