发射线星系的理论模拟：中红外和光学光谱学的新分类参数
Theoretical Modeling of Emission-Line galaxies: New Classification Parameters for Mid-Infrared and Optical Spectroscopy
摘要：
我们已经进行了广泛而详细的光电离建模，成功地限制了不同的发射线星系在光学和中红外诊断图的位置。我们的模型网格覆盖了广泛的参数空间的活动星系连续体和星暴星系不同的恒星星族法律和金属丰度。我们将活动星系核和恒星形成的中红外线比值[Ne III] 15.56 mm/[Ne II] 12.81 mm和[O IV] 25.89 mm/[Ne III] 15.56 mm与观测值进行了比较，发现对活动星系核的最佳拟合是通过两区近似。这两个区域近似是一个物质约束的组件，其中[Ne III]和[O IV]有效地发射，和辐射约束的组件，最大化[Ne II]发射的组合。我们将两区近似的结果叠加到Sloan数字巡天的光学[O III]l5007/H β和[N II] l 6583/H α诊断图上，发现两区近似模型中的高密度和低电离辐射束缚分量为[N II]辐射提供了一个很好的下限。这为图中活动星系核的最小贡献建立了一条新的理论分界线。这一新的分类结果比以前对恒星形成星系的划分所得出的预测结果高出约1.4倍。同样，我们定义了一个最大的活动星系核的贡献在[O III]/H β和[N II]/H α图通过使用一个典型的窄线区域的参数范围内的两个区域的近似。
英文摘要：
We have carried out extensive and detailed photoionization modeling to successfully constrain the locations of different emission-line galaxies in optical and mid-infrared diagnostic diagrams. Our model grids cover a wide range in parameter space for the active galaxy continuum and starburst galaxies with different stellar population laws and metallicities. We compare the predicted AGN and star-formation mid-infrared line ratios [Ne III]15.56mm/[Ne II]12.81mm and [O IV]25.89mm/[Ne III]15.56mm to the observed values, and find that the best fit for the AGN is via a two-zone approximation. This two-zone approximation is a combination of a matter-bounded component, where [Ne III] and [O IV] are emitted efficiently, and a radiation-bounded component that maximizes [Ne II] emission. We overlay the predictions from this two-zone approximation onto the optical [O III]l5007/Hbeta and [N II]l6583/Halpha diagnostic diagram derived from the Sloan Digital Sky Survey, to find that the high-density and low-ionization radiation-bounded component in our two-zone AGN approximation model provides a good lower limit for [N II] emission. This establishes a new theoretical demarcation line for the minimum AGN contribution in this diagram. This new classification results by a factor of ~1.4 in a higher AGN population than predictions derived from previous divisions of star-forming galaxies. Similarly, we define a maximum AGN contribution in the [O III]/Hbeta and [N II]/Halpha diagram by using a two-zone approximation within a parameter range typical of the narrow-line region.
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