基于辐射传输计算的半解析模型的评价和改进II：红外尘埃辐射
Evaluating and Improving Semi-analytic modeling of Dust in Galaxies based on Radiative Transfer Calculations II: Dust Emission in the Infrared
摘要：
星际尘埃颗粒负责改变星系的光谱能量分布（SED），吸收紫外和可见光波长的星光，并将这种能量转化为红外热辐射。为了将星系形成和演化的理论模型的预测与红外区的最新观测结果进行比较，对这些现象的详细描述是至关重要的。在本文中，我们比较GRASIL的结果，一个代码明确地解决了辐射转移方程在尘埃介质中，与各种红外模板库的预测。我们采用恒星形成的历史样本提取的半分析星系形成模型MORGANA创建图书馆的合成SED从近到远红外。我们考虑在不同的红移范围内的模型预测，以探索任何可能的影响，由于预期的星系性质的演变的形状和标准化的SEDs。我们计算GRASIL预测的总吸收星光在光学波长的统计比较合成SED与选定的IR模板。我们表明，在一个给定的总红外光度的合成SED的预测是系统不同的在不同的红移和不同的属性的基础模型星系。然而，我们确定的光谱区域的辐射转移和IR模板的结果之间的协议是良好的统计意义上（即在光度函数方面）。此外，我们强调了一些潜在的相关差异之间的不同的方法，无论是在该地区占主导地位的多环芳烃排放和在亚毫米波长。这些结果确定了潜在的关键问题，在红外光度功能的半解析模型与不同的红外通量估计。
英文摘要：
Interstellar dust grains are responsible for modifying the spectral energy distribution (SED) of galaxies, both absorbing starlight at UV and optical wavelengths and converting this energy into thermal emission in the infrared. The detailed description of these phenomena is of fundamental importance in order to compare the predictions of theoretical models of galaxy formation and evolution with the most recent observations in the infrared region. In this paper we compare the results of GRASIL, a code explicitly solving for the equation of radiative transfer in a dusty medium, with the predictions of a variety of IR template libraries. We employ star formation history samples extracted from the semi-analytical galaxy formation model MORGANA to create libraries of synthetic SEDs from the near- to the far-infrared. We consider model predictions at different redshift ranges to explore any possible influence in the shape and normalization of the SEDs due to the expected evolution of the galaxy properties. We compute the total absorbed starlight predicted by GRASIL at optical wavelengths to statistically compare the synthetic SEDs with the selected IR templates. We show that synthetic SEDs at a given total infrared luminosity are predicted to be systematically different at different redshift and for different properties of the underlying model galaxy. However, we determine spectral regions where the agreement between the results of radiative transfer and IR templates is good in a statistical sense (i.e. in terms of the luminosity functions). Moreover, we highlight some potentially relevant discrepancies between the different approaches, both in the region dominated by PAH emission and at sub-mm wavelengths. These results determine potentially critical issues in the infrared luminosity functions as predicted by semi-analytical models coupled with different IR flux estimators.
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