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arXiv 0901.1207astro-ph.GA
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模拟尘埃演化对不同形态类型星系SEDs的影响

Modeling the effects of dust evolution on the SEDs of galaxies of different morphological type

A. Schurer, F. Calura, L. Silva, A. Pipino, G. L. Granato, F. Matteucci, R. Maiolino

摘要:

我们提出的光度演化模型的星系,其中,除了恒星的组成部分,不断变化的尘埃星际介质的影响已被列入特别照顾。从Calura、Pipino和Matteucci(2008年)的工作开始,其中化学演化模型已被用于研究太阳邻域、椭圆星系和不规则星系中星际介质的气体和尘埃成分的演化,将这些模型与包括尘埃再处理(GRASIL)在内的分光光度恒星代码相结合是可能的(Silva et al. 1998)来分析这些星系的光谱能量分布(SED)的演化。我们测试我们的模型对所观察到的SED在本地宇宙和高红移,并使用它们来预测如何再处理的星光的百分比演变为每种类型的星系。通过比较我们的结果与通过采用简单的假设来处理这个组件所获得的结果,研究了以下尘埃演变的重要性。

英文摘要:

We present photometric evolution models of galaxies, in which, in addition to the stellar component, the effects of an evolving dusty interstellar medium have been included with particular care. Starting from the work of Calura, Pipino & Matteucci (2008), in which chemical evolution models have been used to study the evolution of both the gas and dust components of the interstellar medium in the solar neighbourhood, elliptical and irregular galaxies, it has been possible to combine these models with a spectrophotometric stellar code that includes dust reprocessing (GRASIL) (Silva et al. 1998) to analyse the evolution of the spectral energy distributions (SED) of these galaxies. We test our models against observed SEDs both in the local universe and at high redshift and use them to predict how the percentage of reprocessed starlight evolves for each type of galaxy. The importance of following the dust evolution is investigated by comparing our results with those obtained by adopting simple assumptions to treat this component.

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