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arXiv 1208.5364astro-ph.CO
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IFU时代的氧丰度

The oxygen abundance in the IFU era

F. F. Rosales-Ortega, S. F. Sánchez, A. I. Díaz

摘要:

空间分辨信息的气相排放提供的积分场单元(IFU),使我们能够执行新一代的排放线调查,基于大样本的HII区域和全二维覆盖。在这里,我们提出了我们目前的研究采用这种技术的两个亮点:1)一个统计方法的丰度梯度的螺旋星系,这表明一个普遍的径向梯度的氧丰度;和2)发现一个新的标度关系的HII区的螺旋星系,“本地”的质量金属丰度关系的恒星形成星系。

英文摘要:

Spatially-resolved information of gas-phase emission provided by integral field units (IFUs) are allowing us to perform a new generation of emission-line surveys, based on large samples of HII regions and full two-dimensional coverage. Here we present two highlights of our current studies employing this technique: 1) A statistical approach to the abundance gradients of spiral galaxies, which indicates an -universal- radial gradient for oxygen abundance; and 2) The discovery of a new scaling relation of HII regions in spiral galaxies, the "local" mass-metallicity relation of star-forming galaxies.

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