The infrared structure of M33
The infrared structure of M33
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M33的红外结构
DOI：
10.1086/168997
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
W. Freedman
中科院分区：
文献类型：
--
作者：
W. Rice;F. Boulanger;F. Viallefond;B. Soifer;W. Freedman
IRAS空间观测M33的紫外线，光学和无线电波长数据进行了比较。在12，25，60和100微米的发射出现两个明亮的螺旋臂叠加在一个扩散盘上，与本地化的源的位置的核和最明亮的H II区复合物。M33的整体红外特性是静态螺旋的特征。8-30微米的中红外全局发射约为远红外发射的20%，类似于在局部ISM中发现的这些通量的比率。M33的局部红外过剩比银河系H II区的过剩大2-3倍。红外颜色的径向分布是平坦的或接近平坦的，这意味着在整个扩散盘的尘埃温度接近恒定。M33的F（IR）-射电连续辐射与其他星系相似，但两个辐射分量的径向分布不同。红外发射结构与H Ⅱ区的分布之间存在着显著的相关性。参考文献61篇。
IRAS spatial observations of M33 are presented and compared to UV, optical, and radio wavelength data. At 12, 25, 60, and 100 microns the emission appears as two bright spiral arms superposed on a diffuse disk, with localized sources at the position of the nucleus and the brightest H II region complexes. The global IR properties of M33 are characteristic of quiescent spirals. The 8-30 micron mid-IR global emission is about 20 percent of the far-IR emission, similar to the ratio of these fluxes found for the local ISM. The local IR excess of M33 is about 2-3 times larger than the excess derived for H II regions in the Galaxy. The radial distributions of the IR colors are flat or nearly flat, implying near-constant dust temperatures across the diffuse disk. The integrated F(IR)-to-radio continuum emission of M33 follows the relation seen in other galaxies, but the radial distribution of the two emission components differ. A striking correlation is seen between the IR emission structure and the distribution of H II regions. 61 refs.