The Low Metallicity ISM of Dwarf Galaxies

被引：0
作者：
Suzanne C. Madden
机构：
[1] CEA Saclay,Service d'Astrophysique
来源：
Astrophysics and Space Science | 2002年 / 281卷
关键词：
Dust; PAHs; Dust Emission; Dwarf Galaxy; Dust Mass;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The properties of the low metallicity environments of dwarf galaxies are studied through dust observations in conjunction with the FIR fine-structure cooling lines. There is a striking enhancement of the I[CII]/I(CO) in dwarf galaxies that is explained by the decreased attenuation of the UV light in molecular clouds. An important consequence is that a significant mass of the molecular gas mass inventory can be missed through CO observations alone. Modeling the infrared spectral energy distribution into submillimeter wavelengths in dwarf galaxies reveals the presence of very cold (∼ 8K) dust,which accounts for a large fraction of the dust mass, until now missed by models using IRAS observations alone. In spite of the striking defficiency of the mid-infrared aromatic band carriers, cooling in the photodissociation regions, via [CII] line emission is a very efficient process.
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页码：247 / 252
页数：5
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