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arXiv 1202.4938astro-ph.SR
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致密分子核中乙醇醛的形成

On the formation of glycolaldehyde in dense molecular cores

Paul M. Woods, George Kelly, Serena Viti, Ben Slater, Wendy A. Brown, Fabrizio Puletti, Daren J. Burke, Zamaan Raza

备注：
13 pages, 3 figures, 3 tables, accepted for publication in the Astrophysical Journal
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摘要：

乙醇醛是一种简单的单糖，与益生元化学有关。最近在恒星形成区G31.41+0.31的分子核心中发现了它，丰度相当高。我们研究了乙醇醛在10K下的形成，以确定它是否可以在典型的致密核条件下有效地形成。使用天体化学模型，我们测试了五种不同的反应机制，已提出在天体物理学文献中，发现气相形成路线是不可能的。在颗粒表面形成途径中，只有两种在非常低的温度下足够有效，以产生足够的乙醇醛来匹配观测估计，最终形成CH3OH + HCO的机制受到青睐。然而，当我们从反应化学的角度考虑这些机制的可行性时，第二种颗粒表面途径看起来更有希望，H3CO + HCO。

英文摘要：

Glycolaldehyde is a simple monosaccharide sugar linked to prebiotic chemistry. Recently it was detected in a molecular core in the star-forming region G31.41+0.31 at a reasonably high abundance. We investigate the formation of glycolaldehyde at 10K to determine whether it can form efficiently under typical dense core conditions. Using an astrochemical model, we test five different reaction mechanisms that have been proposed in the astrophysical literature, finding that a gas-phase formation route is unlikely. Of the grain-surface formation routes, only two are efficient enough at very low temperatures to produce sufficient glycolaldehyde to match the observational estimates, with the mechanism culminating in CH3OH + HCO being favoured. However, when we consider the feasibility of these mechanisms from a reaction chemistry perspective, the second grain-surface route looks more promising, H3CO + HCO.

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