论文标题
理论上用分形几何形状在三个维度上对光电离区域进行建模
Theoretically Modelling Photoionized Regions with Fractal Geometry in Three Dimensions
论文作者
论文摘要
我们通过使用最先进的Messenger Monte-Carlo Mappings〜V代码（M $^3 $）与CMFGEN Stellar Altiveerere模型一起创建一个嵌入在动荡ISM中的光电离世模型。我们表明，湍流的ISM导致了星云内电子温度和密度的不均匀性。湍流ISM中的波动产生了附近星云中看到的复杂电离结构。星云内的不均匀密度分布在空间分辨的标准光学诊断图上产生了显着的散射，这不能由球形恒定密度光电离世模型表示。我们分析了不同光学发射线对轴向几何复杂性的依赖性，发现驻留在轴向边界上的发射线对变形线的复杂性高度敏感，而整个星云中产生的发射线对Nebula内的ISM的密度分布敏感。我们的分形光电离模型表明，对于HII区域和发射线星系的准确建模，需要复杂的Nebular几何形状，尤其是对于高红移星系，基于越来越多的ISM，ISM是高度湍流的。
We create a photoionization model embedded in the turbulent ISM by using the state-of-the-art Messenger Monte-Carlo MAPPINGS~V code (M$^3$) in conjunction with the CMFGEN stellar atmosphere model. We show that the turbulent ISM causes the inhomogeneity of electron temperature and density within the nebula. The fluctuation in the turbulent ISM creates complex ionization structures seen in nearby nebulae. The inhomogeneous density distribution within the nebula creates a significant scatter on the spatially-resolved standard optical diagnostic diagrams, which cannot be represented by the spherical constant density photoionization model. We analyze the dependence of different optical emission lines on the complexity of nebular geometry, finding that the emission-lines residing on the nebular boundary are highly sensitive to the complexity of nebular geometry, while the emission-lines produced throughout the nebula are sensitive to the density distribution of the ISM within the nebula. Our fractal photoionization model demonstrates that a complex nebular geometry is required for accurate modeling of HII regions and emission-line galaxies, especially for the high-redshift galaxies, where the ISM is highly turbulent based on the increasing observational evidence.
