银河系球状星团轨道参数分布的Monte Carlo模拟  

Monte Carlo Simulation of Distribution of Orbital Parameters for Globular Clusters in the Galaxy

作　　者：王龙[1] 周洪楠[1] 

机构地区：[1]南京师范大学物理科学与技术学院,南京210097

出　　处：《天文学报》2003年第2期147-155,共9页Acta Astronomica Sinica

基　　金：国家自然科学基金(NSF10273007)

摘　　要：选取前文中所列出的29个累积光谱型为F型的球状星团中的3个作为样本,深入研究了初始观测资料的不确定性和选用不同的银河系引力势模型,对样本星团轨道参数的影响。首先采用Monte Carlo方法产生3个样本球状星团的模拟初始观测数据。而后,以这些模拟数据为初始条件,在3种不同的银河系引力势模型下进行轨道计算,得到此3个样本的模拟轨道参数。模拟计算的结果表明:根据模拟初始数据生成的样本轨道参数分布形态大致可分为高斯分布、准高斯分布和非高斯分布等3类;初始观测数据的不确定性对样本轨道参数分布的影响,与样本星团的选择和轨道参数的类型有关;选用不同的银河系引力势模型,对3个样本星团的各个轨道参数的分布和形态结构也会产生不同程度的影响。该工作的结果,可供深入研究球状星团的整体运动和动力学性质等问题参考。On the base of previous work, we investigate the effect of orbital parameters of 3 globular clusters on the uncertainties of initial observational data. The uncertainties associated with the observational data were derived in a Monte Carlo approach, and the orbital parameters are calculated using the simulation data for 3 globular clusters. The results show that the distribution morphologies of the orbital parameters which are produced by simulation data are separated into three types: Gaussian profile, semi-Gaussian profile and non- Gaussian profile. The influence of uncertainties of initial observational data on the orbital parameters is related to the selection of the sample clusters and the types of the orbital parameters. Besides, considering the differences of the galactic gravitational potential models, there is different influence for the distribution morphologies of all of the orbital parameters of the selected sample clusters. The results of this work make contributions to the researches of kinematics and dynamics of globular clusters.

关 键 词：球状星团 轨道参数 引力势模型 高斯分布 

分 类 号：P154[天文地球—天文学]