Small Molecular Clouds: Deep IRAS Photometry and 12CO Spectroscopy
Small Molecular Clouds: Deep IRAS Photometry and 12CO Spectroscopy
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小分子云：深度 IRAS 光度测定和 12CO 光谱
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
M. Heyer
中科院分区：
文献类型：
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作者：
James S. Yun;D. Clemens;M. Heyer
对Clemens和Barvainis（1988）编目的小分子云的整个样品，已经用深的、联合的IRAS测量数据分析和（C-12）O光谱学进行了探测。远红外颜色与其他无定形银河系成分的颜色相似。平均12.25微米颜色为0.01，平均25/60微米颜色为0.68，平均60/100微米颜色为0.70。大部分尘埃的温度低于30 K。尘埃光学厚度与60/100微米色温之间存在很强的负相关关系。样品的平均远红外光度约为6.4太阳光度，平均云质量约为11太阳，半径约为0.35 pc，密度约为1000 H2/cu cm。银河系中这些云的数量上限和下限分别为160，000和650，000。博克球状体的银河系总质量约为350万个太阳，总光度约为200万个太阳。参考文献45。
The entire sample of small molecular clouds cataloged by Clemens and Barvainis (1988) has been probed using deep, coadded IRAS survey data analysis and (C-12)O spectroscopy. The far-IR colors are similar to those found for other amorphous Galactic constituents. The mean 12.25 micron color was 0.01, the mean 25/60 micron color was 0.68, and the mean 60/100 micron color was 0.70. The bulk of the dust mass was colder than 30 K. A very strong anticorrelation was found between dust optical depth and 60/100 micron color temperature. The mean far-IR luminosity of the sample is about 6.4 solar luminosities, the mean cloud mass is about 11 solar, the radius is around 0.35 pc, and the density is around 1000 H2/cu cm. Upper and lower limits for the number of these clouds in the Galaxy are 160,000 and 650,000. A total Galactic mass in Bok globules of about 3.5 million solar and a total luminosity of about two million solar is found. 45 refs.