FORMATION PUMPING OF MOLECULAR HYDROGEN IN DARK CLOUDS
FORMATION PUMPING OF MOLECULAR HYDROGEN IN DARK CLOUDS
复制标题
暗云中氢分子的地层泵浦
DOI：
10.1088/0004-637x/725/1/1111
复制
发表时间：
2010
期刊：
影响因子：
--
通讯作者：
S. Casu
中科院分区：
文献类型：
--
作者：
F. Islam;C. Cecchi;S. Viti;S. Casu
许多理论和实验室研究预测H2在高激发振转态下形成。在适当的星际区域的辐射中，可以观察到激发能级通过一连串的红外跃迁而弛豫。在这项工作中，我们模拟H2形成泵在标准的稠密云，考虑到H/H2过渡区，通过准确的化学和辐射传输的描述。该模型包括最近的实验室数据H2的形成，以及星际紫外线场的影响，预测的气相H2分子和他们的红外发射光谱的人口。计算表明，H2的某些振动激发态可能在H2发生显著破坏的视线中被检测到，例如X射线源，并提供了一个可能的解释，为什么观测尝试导致迄今为止没有检测报告。
Many theoretical and laboratory studies predict H2 to be formed in highly excited rovibrational states. The consequent relaxation of excited levels via a cascade of infrared transitions might be observable in emission from suitable interstellar regions. In this work, we model H2 formation pumping in standard dense clouds, taking into account the H/H2 transition zone, through an accurate description of chemistry and radiative transfer. The model includes recent laboratory data on H2 formation, as well as the effects of the interstellar UV field, predicting the populations of gas-phase H2 molecules and their IR emission spectra. Calculations suggest that some vibrationally excited states of H2 might be detectable toward lines of sight where significant destruction of H2 occurs, such as X-ray sources, and provides a possible explanation as to why observational attempts resulted in no detections reported to date.