论文标题
放射分解在C $ _ {2} $ h $ _ {4} $ o $ $ _ {2} $ isomers和dimethyl ether中的dimethyl ether中的作用
The Role of Radiolysis in the Modelling of C$_{2}$H$_{4}$O$_{2}$ Isomers and Dimethyl Ether in Cold Dark Clouds
论文作者
论文摘要
在多种星际源中检测到了复杂的有机分子（COM）。这些COM在变暖来源中的丰度可以通过与温度和密度升高有关的合成来解释，从而使准热化学反应发生足够快地发生，以产生可观察量的COM，无论是在气相还是在灰尘颗粒冰盖上。然后，随着温度升高以使其热解吸，在晶粒上产生的COM变得气态。这些气相和灰尘生产途径最近对冷来源中气态com的观察结果尚未完全解释。放射分解化学是在冷乌云中产生COM的一种非热方法。这种新方法大大增加了由于宇宙射线轰炸引起的激发和电离事件，因此在冰表面和冰表面上所选的COM的建模丰度。我们检查了放射分解对三个c $ _ {2} $ h $ _ {4} $ o $ $ _ {2} $ isomers-甲基甲酸盐（hcoooch $ _3 $），甘脂醛（hcoch $ _2 $ oh）和乙酸（ch $ _3 $ cooh） - ch $ _3 $ cohyl con， （Ch $ _3 $ och $ _3 $），在冷云中。然后，我们将模型的气态丰度与观察到的TMC-1，L1689B和B1-B中观察到的丰度进行了比较。
Complex organic molecules (COMs) have been detected in a variety of interstellar sources. The abundances of these COMs in warming sources can be explained by syntheses linked to increasing temperatures and densities, allowing quasi-thermal chemical reactions to occur rapidly enough to produce observable amounts of COMs, both in the gas phase, and upon dust grain ice mantles. The COMs produced on grains then become gaseous as the temperature increases sufficiently to allow their thermal desorption. The recent observation of gaseous COMs in cold sources has not been fully explained by these gas-phase and dust grain production routes. Radiolysis chemistry is a possible non-thermal method of producing COMs in cold dark clouds. This new method greatly increases the modeled abundance of selected COMs upon the ice surface and within the ice mantle due to excitation and ionization events from cosmic ray bombardment. We examine the effect of radiolysis on three C$_{2}$H$_{4}$O$_{2}$ isomers -- methyl formate (HCOOCH$_3$), glycolaldehyde (HCOCH$_2$OH), and acetic acid (CH$_3$COOH) -- and a chemically similar molecule, dimethyl ether (CH$_3$OCH$_3$), in cold dark clouds. We then compare our modelled gaseous abundances with observed abundances in TMC-1, L1689B, and B1-b.
