Evolution of Cloud Cores Forming Massive Star and Star Clusters

我们的研究目的是探讨形成大质量恒星和星星团的分子云核的物理性质。我们首先利用2微米全天巡天点源目录（2MASS PSC）制作了一个全天空稠密云核目录。基于该星表，我们对一些伴随着年轻红外星系团的致密核心进行了分子线观测，以获得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.