Rates and fractions (saturated and decreased ISRF and CR rates)

Similar to Ploeckinger & Schaye (2020) but with the following changes:

- turbulence of 6km/s is added in the Cloudy calculations
- turbulent pressure of 6 km/s is included in the calculation of the Jeans column density (pressure = max of turbulent and thermal pressure)
- ISRF scales with the new Jeans column density (incl. turbulent pressure) but saturates at a column density of 1.3e22 cm-2 (corresponds to 100 pc turbulent Jeans length)
- cosmic ray rate scales with the new Jeans column density according to the Lacki et al. (2010) scaling (CR rate proportional to the column density) and saturates at a Milky Way value of 3.63e20 cm-2 (this is the log N_0 = 20.56 value used in PS20)
- both the CR rate and the ISRF are scaled down by 2 dex (1 dex more than in the fiducial model from PS20 for a given column density but note that the column densities are higher in the ISM due to the turbulent pressure contribution).

本数据集与Ploeckinger与Schaye（2020）的研究框架一致，但存在以下调整：
- 在Cloudy计算中加入了6km/s的湍流速度
- 在金斯柱密度（Jeans column density）的计算中纳入了6km/s对应的湍流压强，压强取湍流压强与热压强的最大值
- 星际辐射场（ISRF）随更新后的金斯柱密度（包含湍流压强贡献）进行缩放，且在柱密度达到1.3×10²² cm⁻²时趋于饱和（该柱密度对应100 pc的湍流金斯长度）
- 宇宙线速率依据Lacki等人（2010）提出的标度关系，随更新后的金斯柱密度进行缩放（宇宙线速率与柱密度成正比），并在柱密度达到银河系标准值3.63×10²⁰ cm⁻²时趋于饱和（该值对应PS20中使用的log N₀=20.56）
- 宇宙线速率与星际辐射场均被下调2个dex（对于给定柱密度，该下调幅度较PS20的基准模型多出1个dex，但需注意：由于湍流压强的贡献，星际介质（ISM）中的柱密度更高）