大质量分子云核的坍缩研究

In this project, large samples of multiple molecular lines in multi-bands in massive star-forming regions have been studied systematically with large and advanced telescopes (BIAM, HHT, Effelsberg 100-m, and 13.7m telescopes, etc.) at home and abroad. We have found that the star formation starts with the collapse of a molecular cloud core and occurring high velocity outflows simultaneously, and associated with masers at a certain phase. More than 100 objects are observed, and some of them (such as W51, and Orion) are studied in detail using multi-traces of molecular lines, involving their dynamic structures and physical properties. We put forward the forming mechanism about the line width of massive outflows and have obtained the physical condition of forming methanol and water masers. 12 papers and many scientific reports, including 3 international ones are published under the aid of the fund.

本项目通过对大质量分子云核的高空间分辨率的观测研究，对分子云核的结构、速率分布、密度分布及分子外流的驱动源进行系统的研究，探索大质量恒星形成区发生坍缩的条件、坍缩的动力学过程。对原恒星的形成过程特别是在说明大中质量星团的形成方面，大质量分子外流的形成机制等具有重要意义。