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arXiv 0912.0528astro-ph.CO
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解释星系紫外、光学和红外SED的一个简单模型

A simple model to interpret the ultraviolet, optical and infrared SEDs of galaxies

Elisabete da Cunha, Stephane Charlot, David Elbaz

摘要:

我们提出了一个简单的,主要是经验,但物理动机的模型,它的目的是解释一致的多波长观测从大样本的星系的物理参数,如恒星形成率,恒星质量和尘埃含量。我们的模型是简单和通用的,足以允许推导的恒星形成的历史和尘埃含量的大样本的星系使用范围广泛的紫外线,光学和红外观测的统计约束。我们说明了这一点,推导出一组物理参数的中位数似然估计描述恒星和尘埃含量的本地恒星形成星系的斯皮策红外近星系样本(SINGS)和新匹配的SDSS星系与GALEX,2MASS和IRAS观察到的样本。该模型很好地再现了观测到的光谱能量分布,这些星系在整个波长范围内,从远紫外到远红外。我们发现星系的物理参数之间的重要相关性,这是有用的,以调查恒星形成活动和星系的尘埃性质。我们的模型可以直接应用于解释观测到的紫外到红外光谱能量分布(SED)从任何星系样本。

英文摘要:

We present a simple, largely empirical but physically motivated model, which is designed to interpret consistently multi-wavelength observations from large samples of galaxies in terms of physical parameters, such as star formation rate, stellar mass and dust content. Our model is both simple and versatile enough to allow the derivation of statistical constraints on the star formation histories and dust contents of large samples of galaxies using a wide range of ultraviolet, optical and infrared observations. We illustrate this by deriving median-likelihood estimates of a set of physical parameters describing the stellar and dust contents of local star-forming galaxies from the Spitzer Infrared Nearby Galaxy Sample (SINGS) and from a newly-matched sample of SDSS galaxies observed with GALEX, 2MASS, and IRAS. The model reproduces well the observed spectral energy distributions of these galaxies across the entire wavelength range from the far-ultraviolet to the far-infrared. We find important correlations between the physical parameters of galaxies which are useful to investigate the star formation activity and dust properties of galaxies. Our model can be straightforwardly applied to interpret observed ultraviolet-to-infrared spectral energy distributions (SEDs) from any galaxy sample.

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