Temperature and density dependent cooling function for H2 with updated H2/H collisional rates
Temperature and density dependent cooling function for H2 with updated H2/H collisional rates
复制标题
具有更新的 H2/H 碰撞率的 H2 温度和密度相关冷却功能
DOI：
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发表时间：
2019
影响因子：
4.8
通讯作者：
M. Kazandjian
中科院分区：
文献类型：
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作者：
C. Coppola;F. Lique;F. Mazzia;F. Esposito;M. Kazandjian
气体中各组成部分之间的能量传递决定了它的命运。特别是在低温下，非弹性碰撞驱动冷却和加热机制。在早期宇宙中，以及在金属丰度为零或低的环境中，主要的贡献来自原子和分子氢之间的碰撞，也是氘化氢的形式。这项工作显示了一些基于新的碰撞数据的H2冷却函数的更新计算，这些数据明确地考虑了低温下的反应途径。讨论了与先前计算的偏差，并进行了多变量数据分析，以根据气体温度和气体密度提供拟合。
The energy transfer among the components in a gas determines its fate. Especially at low temperatures, inelastic collisions drive the cooling and the heating mechanisms. In the early Universe as well as in zero- or low-metallicity environments the major contribution comes from the collisions among atomic and molecular hydrogen, also in its deuterated version. This work shows some updated calculations of the H2 cooling function based on novel collisional data which explicitly take into account the reactive pathway at low temperatures. Deviations from previous calculations are discussed and a multivariate data analysis is performed to provide a fit depending on both the gas temperature and the density of the gas.