Ultra-compact HII regions

被引:7
|
作者
Hoare, MG [1 ]
机构
[1] Univ Leeds, Sch Phys & Astron, Leeds, W Yorkshire, England
关键词
star formation; HII regions; molecular clouds;
D O I
10.1007/s10509-005-3690-1
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
This article reviews how observations of dense molecular gas can help us understand the dynamics and evolution of ultra-compact H II (UCHII) regions. Particular attention is paid to the cometary objects, which it is argued are likely to be the dominant class. Thermal molecular lines in emission and absorption are considered as well as the mainly dynamical information from masers. Most of the UCHII regions studied at high resolution have hot cores ahead them which makes interpretation of molecular observations much more complex. Significant support for the champagne flow model for cometary regions can been seen, adding to the evidence from studies of the ionised gas. How the prevalence of cometary objects may fit into a triggered, sequential picture of massive star formation is outlined.
引用
收藏
页码:203 / 215
页数:13
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