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首页> 外文期刊>The Astrophysical journal >IMPLICATIONS OF SUBMILLIMETER WAVE ASTRONOMY SATELLITE OBSERVATIONS FOR INTERSTELLAR CHEMISTRY AND STAR FORMATION
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IMPLICATIONS OF SUBMILLIMETER WAVE ASTRONOMY SATELLITE OBSERVATIONS FOR INTERSTELLAR CHEMISTRY AND STAR FORMATION

机译：子午线天文卫星观测对星际化学和恒星形成的影响

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A long-standing prediction of steady state gas-phase chemical theory is that H_2O and O_2 are important reservoirs of elemental oxygen and major coolants of the interstellar medium. Analysis of Submillimeter Wave Astronomy Satellite (SWAS) observations has set sensitive upper limits on the abundance of O_2 and has provided H_2O abundances toward a variety of star-forming regions. Based on these results, we show that gaseous H_2O and O_2 are not dominant carriers of elemental oxygen in molecular clouds. Instead, the available oxygen is presumably frozen on dust grains in the form of molecular ices, with a significant portion potentially remaining in atomic form, along with CO, in the gas phase. H_2O and O_2 are also not significant coolants for quiescent molecular gas. In the case of H_2O, a number of known chemical processes can locally elevate its abundance in regions with enhanced temperatures, such as warm regions surrounding young stars or in hot shocked gas. Thus, water can be a locally important coolant. The new information provided by SWAS, when combined with recent results from the Infrared Space Observatory, also provides several hard observational constraints for theoretical models of the chemistry in molecular clouds, and we discuss various models that satisfy these conditions.
机译：对稳态气相化学理论的长期预测是，H_2O和O_2是星际介质中元素氧和主要冷却剂的重要储层。亚毫米波天文学卫星（SWAS）观测结果的分析为O_2的丰度设置了敏感的上限，并向各种恒星形成区域提供了H_2O丰度。基于这些结果，我们表明气态H_2O和O_2不是分子云中元素氧的主要载体。取而代之的是，可用的氧气大概以分子冰的形式冻结在尘埃颗粒上，其中很大一部分可能与CO一起以原子形式保留在气相中。 H_2O和O_2并不是静态分子气体的重要冷却剂。在H_2O的情况下，许多已知的化学过程可以在温度升高的区域（例如年轻恒星周围的温暖区域或热冲击气体中）局部提高其丰度。因此，水可以是局部重要的冷却剂。 SWAS提供的新信息与红外空间天文台的最新结果相结合，也为分子云化学理论模型提供了一些严格的观测约束，我们将讨论满足这些条件的各种模型。

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