球状星团M4的动力学质量

Dynamical Mass of the Globular Cluster M4

M4(NGC 6121)是离太阳最近的一个球状星团,是研究各种天体物理问题的重要实验室。质量是球状星团的重要物理量,对于研究星团的动力学演化历史有重要意义。由于球状星团中有大量不可见物质(白矮星、中子星、黑洞),给质量的估算带来一定麻烦,本文基于M4中851颗单星成员的高精度视向速度数据分析了星团的内禀速度弥散度,再根据位力定理计算出M4的动力学质量为8.59×10~4M⊙,文中的动力学质量已经包含了不可见物质的质量。

M4（NGC 6121）is the nearest globular cluster,which is an important labortory for studying many problems in astrophysics.Mass is an important parameter for globular clusters,which can be used to analyze the dynamical evolution of globular clusters.The mass estimation of a globular cluster usually suffers from a large amount of invisible matters such as white drawfs,neutron stars and black holes.This paper presents an estimate for the dynamical mass of M4 based on high-precision radial velocities and the virial theorem.The cluster dynamical mass is determined to be 8.59×10~4 M⊙based on 851 single stars,which has included the mass of invisible matters.