Photodissociation regions. I - Basic model. II - A model for the Orion photodissociation region
Photodissociation regions. I - Basic model. II - A model for the Orion photodissociation region
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DOI：
10.1086/163111
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发表时间：
1985-04
期刊：
影响因子：
--
通讯作者：
A. Tielens;D. Hollenbach
中科院分区：
文献类型：
--
作者：
A. Tielens;D. Hollenbach
对致密光解离区的温度、化学结构及其产物光谱进行了理论参数研究。所讨论的模型不仅适用于分子云和HⅡ区之间的尘埃和气体，而且也适用于任何受到强FUV通量照射的中性云。这些模型将观测到的线和连续辐射与气体密度和温度、元素丰度和化学丰度、局部辐射场和颗粒性质等物理参数联系起来。结果应用于OMC-1地区的观测数据。模型表明，观测到的高亮度温度可以用C(+)/C/CO过渡区的发射来解释。这与以往的化学模型的不同之处在于碳的气相元素丰度较高，C(+)与S和SiO的电荷交换反应以及碳的自屏蔽作用。参考文献152篇。
A theoretical parameter study of the temperature and chemical structure of dense photodissociation regions and their resultant spectrum is presented. Models are discussed which are relevant not only to the dust and gas between molecular clouds and H II regions, but also apply to any neutral cloud illuminated by intense FUV fluxes. The models relate observed line and continuum emission from these regions to physical parameters such as the gas density and temperature, the elemental and chemical abundances, the local radiation field, and the grain properties. The results are applied to observational data from the OMC-1 region. The model shows that the observed high brightness temperature of the C I 609 microns line can be explained by emission from the C(+)/C/CO transition region. This difference with previous chemical models is due to a higher gas phase elemental abundance of carbon, to the charge exchange reactions of C(+) with S and SiO, and to carbon self-shielding. 152 references.