Ion-by-ion冷却效率
Ion-by-ion Cooling efficiencies
摘要：
我们提出了低密度气体的离子冷却效率。我们使用云（ver. 08.00）来单独估计前30种元素（H-Zn）的每个离子的冷却效率。我们目前的结果为气体温度在1 e4和1 e8 K之间，假设低密度和光学薄的条件。当非平衡电离起着重要的作用时，电离状态偏离碰撞电离平衡（CIE）中获得的电离状态，并且在任何给定温度下的局部冷却效率取决于特定的非平衡离子分数。这里给出的结果允许任何离子组合物的总冷却效率的有效估计。我们还列出了假设CIE条件下的元素冷却效率。这些可以用于构建非太阳丰度比的CIE冷却效率，或者估计由于任何非平衡计算中未明确包括的元素而导致的冷却。所有的计算结果都列在方便的在线表格中。
英文摘要：
We present ion-by-ion cooling efficiencies for low-density gas. We use Cloudy (ver. 08.00) to estimate the cooling efficiencies for each ion of the first 30 elements (H-Zn) individually. We present results for gas temperatures between 1e4 and 1e8K, assuming low densities and optically thin conditions. When nonequilibrium ionization plays a significant role the ionization states deviate from those that obtain in collisional ionization equilibrium (CIE), and the local cooling efficiency at any given temperature depends on specific non-equilibrium ion fractions. The results presented here allow for an efficient estimate of the total cooling efficiency for any ionic composition. We also list the elemental cooling efficiencies assuming CIE conditions. These can be used to construct CIE cooling efficiencies for non-solar abundance ratios, or to estimate the cooling due to elements not explicitly included in any nonequilibrium computation. All the computational results are listed in convenient online tables.
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