从紫外到远红外的星系性质：Lambda-CDM模型面对观测
Galaxy Properties from the Ultra-violet to the Far-Infrared: Lambda-CDM models confront observations
摘要：
我们结合一个半解析模型的星系形成简单的分析配方描述的吸收和再发射的星光的尘埃在星际介质的星系。我们使用由此产生的模型来预测星系计数和光度函数从远紫外到亚毫米，从红移5到现在，并与广泛的汇编观测比较。我们发现，为了重现在高红移的休息紫外和光学光度函数，我们必须假设一个不断发展的归一化的尘埃-金属比，这意味着一个给定的热光度（或金属柱密度）的星系必须比他们当地的同行少熄灭。在我们的最佳拟合模型中，我们发现从静止框架1500埃到250微米的观测结果非常吻合。在较长的波长，最引人注目的是在亚毫米，我们的模型低估了一个很大的因素，明亮的星系的数量。该模型再现观察到的总红外光度函数相当不错。我们展示了不同的模型成分的结果，包括尘埃衰减配方，尘埃排放模板和宇宙学的各个方面。我们使用我们的模型来预测集成的河外背景光（EBL），并与观测动机的EBL模型和其他可用的观测约束进行比较。
英文摘要：
We combine a semi-analytic model of galaxy formation with simple analytic recipes describing the absorption and re-emission of starlight by dust in the interstellar medium of galaxies. We use the resulting models to predict galaxy counts and luminosity functions from the far-ultraviolet to the sub-mm, from redshift five to the present, and compare with an extensive compilation of observations. We find that in order to reproduce the rest-UV and optical luminosity functions at high redshift, we must assume an evolving normalization in the dust-to-metal ratio, implying that galaxies of a given bolometric luminosity (or metal column density) must be less extinguished than their local counterparts. In our best-fit model, we find remarkably good agreement with observations from rest-frame 1500 Angstroms to 250 microns. At longer wavelengths, most dramatically in the sub-mm, our models underpredict the number of bright galaxies by a large factor. The models reproduce the observed total IR luminosity function fairly well. We show the results of varying several ingredients of the models, including various aspects of the dust attenuation recipe, the dust emission templates, and the cosmology. We use our models to predict the integrated Extragalactic Background Light (EBL), and compare with an observationally-motivated EBL model and with other available observational constraints.
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