Evolution of Cloud Cores Forming Massive Star and Star Clusters

我们研究的目的是研究形成大质量恒星和星团的分子云核的物理性质。我们首先利用2微米全天勘测点源星表(2MASS PSC)制作了致密云核的全天星表。在星表的基础上，我们对一些伴随着年轻红外团簇的致密核进行了分子线观测，得出了它们的典型分子质量、氢密度、激发温度和速度色散。

The purpose of our study is to investigate physical properties of molecular cloud cores forming massive stars and star clusters. We first produced an all-sky catalog of dense cloud cores utilizing the 2 Micron All Sky Survey Point Source Catalog (2MASS PSC). Based on the catalog, we carried out molecular line observations toward a number of dense cores accompanied by young infrared clusters to derive their typical molecular mass, hydrogen density, excitation temperature, and velocity dispersion.