稠密云化学中的多环芳烃（PAH 's）
Polycylcic Aromatic Hydrocarbons (PAH's) in dense cloud chemistry
摘要：
几乎所有详细的星际云化学气相模型都不包括多环芳烃（PAH）。这一遗漏是不幸的，因为从已经完成的关于该主题的少数研究中，已知包含PAH会强烈影响气相化学。我们已经将PAH添加到我们的网络中，以确定它们在冷致密核的化学中所起的作用。在这里提出的模型中，我们包括辐射附着形成PAH-，PAH阴离子和小的正电荷离子之间的相互中和，和光剥离。我们还测试了我们的结果对PAH的大小和丰度变化的敏感性。我们的研究结果证实，包括多环芳烃的变化，许多较小的物种的计算丰度显着。在TMC-1中，与观测结果的总体一致性与L134 N相反，有显著改善。这可能表明两个区域之间的PAH特性存在差异。在稠密云化学中加入PAH，高金属元素丰度与观测结果吻合。因此，我们不需要降低观察到的所有金属的元素丰度，并且我们不需要改变元素C/O比以在TMC-1（CP）中产生大丰度的碳物质。
英文摘要：
Virtually all detailed gas-phase models of the chemistry of dense interstellar clouds exclude polycyclic aromatic hydrocarbons (PAH's). This omission is unfortunate because from the few studies that have been done on the subject, it is known that the inclusion of PAH's can affect the gas-phase chemistry strongly. We have added PAH's to our network to determine the role they play in the chemistry of cold dense cores. In the models presented here, we include radiative attachment to form PAH-, mutual neutralization between PAH anions and small positively-charged ions, and photodetachment. We also test the sensitivity of our results to changes in the size and abundance of the PAH's. Our results confirm that the inclusion of PAH's changes many of the calculated abundances of smaller species considerably. In TMC-1, the general agreement with observations is significantly improved contrary to L134N. This may indicate a difference in PAH properties between the two regions. With the inclusion of PAH's in dense cloud chemistry, high-metal elemental abundances give a satisfactory agreement with observations. As a result, we do not need to decrease the observed elemental abundances of all metals and we do not need to vary the elemental C/O ratio in order to produce large abundances of carbon species in TMC-1 (CP).
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