论文标题
在随机加热谷物上冷核中的复杂有机分子形成
Complex Organic Molecules Formation in Cold Cores on Stochastically Heated Grains
论文作者
论文摘要
我们研究了随机谷物加热在检测到COM的冷核中复杂有机分子（COM）形成中的作用。化学模型中使用了两种不同类型的晶粒大小分布。第一个是MRN分布，第二个分布考虑了谷物凝结以研究其对这些环境中化学演化的影响。宏观蒙特卡洛法用于执行两相化学模型模拟。我们发现（1）谷物凝血会影响某些气相物种，例如Co $ _2 $和N $ _2 $ H $^+$，在冷核环境中，这可以归因于源自温度波动的小谷物的挥发性前体； （2）半径约4.6 $ \ times $ 10 $^{ - 3} $ $ $ $ $ $ m m $ $ $ $ m $ m在冷核条件下的粉尘谷物上的生产最大，而在较小的晶粒上，很少有种类的物种小于2 $ \ 2 $ \ times $ 10 $ $ 10 $^{-3} $ $ $ $ $ $ m; （3）在随机加热的谷物上形成的COM可以帮助解释冷核中观察到的气相COM的丰富性。
We investigate the roles of stochastic grain heating in the formation of complex organic molecules (COMs) in cold cores, where COMs have been detected. Two different types of grain-size distributions are used in the chemical models. The first one is the MRN distribution, and the second one considers grain coagulation to study its effects on the chemical evolution in these environments. The macroscopic Monte Carlo method is used to perform the two-phase chemical model simulations. We find that (1) grain coagulation can affect certain gas-phase species, such as CO$_2$ and N$_2$H$^+$, in the cold core environments, which can be attributed to the volatile precursors originating from the small grains with temperature fluctuations; (2) grains with radii around 4.6 $\times$ 10$^{-3}$ $μ$m contribute most to the production of COMs on dust grains under cold core conditions, while few species can be formed on even smaller grains with radii less than 2 $\times$ 10$^{-3}$ $μ$m; (3) COMs formed on stochastically heated grains could help explain the observed abundances of gas-phase COMs in cold cores.
