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arXiv 0705.3519astro-ph
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发光、超亮和超亮红外星系中尘埃气体比的比较

Comparison of dust-to-gas ratios in luminous, ultraluminous, and hyperluminous infrared galaxies

M. Contini, T. Contini

摘要:

在三个不同的样品中的发光,超亮,超亮红外星系的尘埃气体比的计算通过模拟他们的无线电软X射线光谱能量分布的复合模型,占光电离辐射从HII地区,星爆,或活动星系,和冲击。模型仅限于一套广泛再现中红外线精细结构线的本地,红外明亮,星爆星系的比率。结果表明,两类云对红外辐射有贡献。那些具有低激波速度和低震前密度的特征解释了远红外尘埃发射,而那些具有较高速度和密度的特征则有助于中红外尘埃发射。活动星系核存在于几乎所有的超亮红外星系和一半的亮红外星系中。高红外光度取决于尘埃与气体的质量比约为0.1,然而,大多数超亮红外星系的尘埃与气体的比例远低于明亮和超亮红外星系的计算值。

英文摘要:

The dust-to-gas ratios in three different samples of luminous, ultraluminous, and hyperluminous infrared galaxies are calculated by modelling their radio to soft X-ray spectral energy distributions using composite models which account for the photoionizing radiation from HII regions, starbursts, or AGNs, and for shocks. The models are limited to a set which broadly reproduces the mid-IR fine structure line ratios of local, IR bright, starburst galaxies. The results show that two types of clouds contribute to the IR emission. Those characterized by low shock velocities and low preshock densities explain the far-IR dust emission, while those with higher velocities and densities contribute to mid-IR dust emission. An AGN is found in nearly all of the ultraluminous IR galaxies and in half of the luminous IR galaxies of the sample. High IR luminosities depend on dust-to-gas ratios of about 0.1 by mass, however, most hyperluminous IR galaxies show dust-to-gas ratios much lower than those calculated for the luminous and ultraluminous IR galaxies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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