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arXiv 1408.3071astro-ph.GA
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简单双原子分子的星际消光和丰度

Interstellar extinction and abundances of simple diatomic molecules

T. Weselak, J. Krełowski

摘要:

本文分析了在半透明视线上观测到的CN、CH和CH阳离子等双原子分子的柱密度与星际消光E(B-V)的相互关系。在这项研究中使用了五个中阶梯光谱仪,位于北半球和南半球,获得的观测材料。虽然CH、CH+的柱密度与E(B-V)相当紧密地相关,但CN的类似关系显示出很大的分散性。这一结果表明,CH和CH+分子是相当好的空间相关的星际尘埃,而CN需要另一个条件形成。CH分子与H_2密切相关,这一点已经得到证实;这一事实是有趣的,因为H_2被认为是在颗粒表面而不是在气相中形成的。

英文摘要:

We analyze mutual relations between interstellar extinction E(B-V) and column densities of diatomic molecules such as CN, CH and CH cation observed along translucent sightlines. Observational material acquired using five echelle spectrographs, situated in both northern and southern hemispheres, was used in this study. While column densities of CH, CH+ correlate reasonably tightly with E(B-V) the similar relation built for CN shows a large scatter. This result suggests that CH and CH+ molecules are quite well spatially correlated to interstellar dust while CN requires another conditions to be formed. The CH molecule is closely related to H_2 as it was demonstrated already; the fact is interesting since H_2 is believed to be formed on grain surfaces rather than in the gas phase.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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