Abstract

In this work we analyze the effect of gas-dust clumps, possibly formed in the interstellar medium due to instability, described in [10], on the chemical evolution of the diffuse interstellar medium. For this purpose we calculate chemical evolution with common parameters of diffuse interstellar medium (ISM). It is shown that abundances of most observed molecules are higher in a model of the diffuse medium with clumps than in a model with homogeneous dust distribution. In some cases it leads to better agreement of modelling abundances and their relations with observational data. But at the same time, it does not mean that the hypothesis about inhomogenous dust distribution can qualitatively improve the agreement between modelling and observational data on the chemical composition of the diffuse interstellar medium. The best-fit range of values of the physical characteristics of the medium is wider under the assumption that dust can form compact gas-dust clumps and is not uniformly mixed with gas. Results described in this work show that small-scale (\( \leqslant {\kern 1pt} 1\) au) inhomogeneities of the interstellar medium can be important for its chemical evolution.

中文翻译：

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尘埃的小空间分布对弥漫星际介质化学演化的影响

摘要

在这项工作中，我们分析了[10]中描述的由于不稳定性而可能在星际介质中形成的尘埃团对弥散星际介质化学演化的影响。为此，我们使用弥散星际介质（ISM）的常用参数来计算化学演化。结果表明，在具有团块的弥散介质模型中，大多数观察到的分子的丰度高于在具有均匀粉尘分布的模型中的丰度。在某些情况下，它可以更好地模拟丰度及其与观测数据之间的关系。但是同时，这并不意味着关于不均匀粉尘分布的假设可以从质量上改善关于星际弥散介质的化学成分的建模和观测数据之间的一致性。在粉尘会形成致密的粉尘团块且不会与气体均匀混合的假设下，介质物理特性值的最佳拟合范围较宽。这项工作中描述的结果表明，\（\ leqslant {\ kern 1pt} 1 \） au）星际介质的不均匀性对其化学演化可能很重要。