论文标题
分离的和嵌入的prestell核之间化学演变的差异
Differences in chemical evolution between isolated and embedded prestellar cores
论文作者
论文摘要
Prestellar核心的模型通常假定核心与环境隔离 - 核心边界之外的材料在随后的进化中没有作用。在现实中，这种情况不太可能是这种情况，在核心位于层次下的分子云中。我们研究了以Bonnor-ebert球体建模的Prestellar核心的动力学和化学演化，并表明环境介质的密度对核心的化学性质具有很大的影响。与具有更多散布周围环境的模型相比，嵌入高密度，低温周围环境中的模型具有极大的增强，例如CO和CS。分子线的预测强度和轮廓形状也受到影响。环境介质的密度对化学演化具有更强的作用，而不是核心最初处于平衡状态。这表明，在对Prestellar核心进行化学建模时，环境的影响不能忽略。这些模型的结果对核心周围环境的假设高度敏感。
Models of prestellar cores often assume that the cores are isolated from their environment - material outside the core boundary plays no role in the subsequent evolution. This is unlikely to be the case in reality, where cores are located within hierarchically substructured molecular clouds. We investigate the dynamical and chemical evolution of prestellar cores, modelled as Bonnor-Ebert spheres, and show that the density of the ambient medium has a large impact on the resulting chemical properties of the cores. Models embedded in high-density, low-temperature surroundings have greatly enhanced abundances of several molecules, such as CO and CS, compared to models with more diffuse surroundings, corresponding to relatively isolated cores. The predicted intensities and profile shapes of molecular lines are also affected. The density of the ambient medium has a stronger effect on the chemical evolution than whether the cores are initially in or out of equilibrium. This suggests that the impact of environment cannot be neglected when modelling chemistry in prestellar cores; the results of these models are highly sensitive to the assumptions made about the core surroundings.
