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arXiv 1701.04411astro-ph.GA
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利用光电离模型推导其余UV中碳和氧的气相丰度

Using photo-ionisation models to derive carbon and oxygen gas-phase abundances in the rest UV

Enrique Pérez-Montero, Ricardo Amorín

摘要:

我们提出了一种新的方法来获得氧和碳的丰度使用的紫外线(UV)线发射的气相电离的大质量恒星。该方法是基于星云的发射线比与预测的光电离模型的大网格的比较。考虑到O/H-C/O平面中的大色散,我们的方法首先使用适当的发射线的比率来固定C/O,并且在第二步骤中,从UV中的碳线计算O/H和电离参数。我们发现丰度完全一致,当我们将这种方法应用到一个样本的对象与经验确定的电子温度使用光发射线提供的直接方法。建议的方法似乎作为一个强大的工具,在高红移恒星形成星系星云丰度的系统研究。

英文摘要:

We present a new method to derive oxygen and carbon abundances using the ultraviolet (UV) lines emitted by the gas-phase ionised by massive stars. The method is based on the comparison of the nebular emission-line ratios with those predicted by a large grid of photo-ionisation models. Given the large dispersion in the O/H - C/O plane, our method firstly fixes C/O using ratios of appropriate emission lines and, in a second step, calculates O/H and the ionisation parameter from carbon lines in the UV. We find abundances totally consistent with those provided by the direct method when we apply this method to a sample of objects with an empirical determination of the electron temperature using optical emission lines. The proposed methodology appears as a powerful tool for systematic studies of nebular abundances in star-forming galaxies at high redshift.

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