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arXiv 1401.0761astro-ph.GAastro-ph.CO
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盘状、不规则和低质量星系的化学和光度演化模型

Chemical and photometric evolution models for disk, irregular and low mass galaxies

Mercedes Mollá

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22 pages, 18 figures, accepted in Advances in Astronomy
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摘要：

我们总结了一套更新的多相化学演化模型进行了44个理论径向质量初始分布和10个可能的值的效率，形成分子云和恒星。我们给出了有关下沉率历史、盘的形成以及扩散和分子气体表面密度、恒星轮廓、恒星形成率表面密度和C、N、O和Fe元素丰度的径向分布的演变的结果，发现这些元素的径向梯度开始非常陡峭，并随着时间的增加或红移的减小而变平，尽管外盘始终显示出一定的扁平度。利用演化合成模型{\sc popstar}得到的单个恒星的光谱能量分布，计算了每个径向区域的光谱能量分布。利用这些SED，我们最终可以计算Johnson系统和SLOAN/SDSS系统中的宽带星等和色径向分布，这是本文的主要结果。我们提出了这些亮度和颜色轮廓的红移的演变。

英文摘要：

We summarize the updated set of multiphase chemical evolution models performed with 44 theoretical radial mass initial distributions and 10 possible values of efficiencies to form molecular clouds and stars. We present the results about the infall rate histories, the formation of the disk, and the evolution of the radial distributions of diffuse and molecular gas surface density, stellar profile, star formation rate surface density and elemental abundances of C,N, O and Fe, finding that the radial gradients for these elements begin very steeper, and flatten with increasing time or decreasing redshift, although the outer disks always show a certain flattening for all times. With the resulting star formation and enrichment histories, we calculate the spectral energy distributions (SEDs) for each radial region by using the ones for single stellar populations resulting from the evolutive synthesis model {\sc popstar}. With these SEDs we may compute finally the broad band magnitudes and colors radial distributions in the Johnson and in the SLOAN/SDSS systems which are the main result of this work. We present the evolution of these brightness and color profiles with the redshift.

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