arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0906.0446astro-ph.CO
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亚毫米星系的星暴和卷云模型

Starburst and cirrus models for submillimeter galaxies

Andreas Efstathiou, Ralf Siebenmorgen

摘要:

我们提出了亚毫米星系的辐射转移模型与光谱红移和中红外光谱从Spitzer/IRS和分析现有的Spitzer/MIPS 24,70和160亩的数据。我们使用两种类型的星爆模型,卷云模型和模型的活动星系核环面的排放,以调查这些对象的性质。我们发现,对于三个对象(25%)卷云发射单独可以占中红外光谱和MIPS和亚毫米数据。对于其余的对象,我们发现,我们需要一个组合的星爆和卷云,以适应同时多波长的数据。我们发现,典型的亚毫米星系在星暴(中值L=10^12.5 Lo)和卷云(中值L=10^12.4 Lo)分量中具有相当的光度。如果星系在过去的2.5亿年里一直在不断地形成恒星,而在过去的500万年里形成的恒星被高光学深度的分子云尘埃所笼罩,而其余的星光则被Av约为1等的弥漫尘埃或卷云所衰减,那么就会出现这种情况。

英文摘要:

We present radiative transfer models for submillimeter galaxies with spectroscopic redshifts and mid-infrared spectroscopy from Spitzer/IRS and analyze available Spitzer/MIPS 24, 70 and 160mu data. We use two types of starburst models, a cirrus model and a model for the emission of an AGN torus in order to investigate the nature of these objects. We find that for three of the objects (25%) cirrus emission alone can account for the mid-infrared spectrum and the MIPS and submillimeter data. For the remaining objects we find that we need a combination of starburst and cirrus in order to fit simultaneously the multi--wavelength data. We find that the typical submillimeter galaxy has comparable luminosity in the starburst (median L=10^12.5 Lo) and cirrus (median L=10^12.4 Lo) components. This could arise if the galaxies have been forming stars continuously for the last 250Myr with the star formation occurring in the last 5Myr being shrouded by high-optical-depth molecular cloud dust, whereas the rest of the starlight is attenuated by diffuse dust or cirrus with an Av of about 1mag.

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