M33中OB缔合物附近HI形态的光解模型
A photodissociation model for the morphology of the HI near OB associations in M33
摘要：
我们提出了一种方法来分析的形态和物理性质的Hi功能附近的巨型OB associations在M33中，在一个模型的背景下，Hi过剩产生的光解离的分子气体的母体巨分子云（GMC）的残余。这里的例子是在NGC 604和CPSDPZ 204的周围，这是M33中两个突出的Hii区域。这些是对该星系中大量OB协会周围环境进行详细分析的第一批结果。我们提出的证据“扩散”的远紫外辐射从OB协会通过cluerous残余GMC，并进一步表明，增强CO（1-0）的排放似乎优先与GMC的体积密度较高。
英文摘要：
We present an approach for analysing the morphology and physical properties of Hi features near giant OB asso- ciations in M33, in the context of a model whereby the Hi excess arises from photodissociation of the molecular gas in remnants of the parent Giant Molecular Clouds (GMCs). Examples are presented here in the environs of NGC604 and CPSDPZ204, two prominent Hii regions in M33. These are the first results of a detailed analysis of the environs of a large number of OB associations in that galaxy. We present evidence for "diffusion" of the far-UV radiation from the OB association through a clumpy remnant GMC, and show further that enhanced CO(1-0) emission appears preferentially associated with GMCs of higher volume density.
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