A CO Survey of the LMC with NANTEN: II. Catalog of Molecular Clouds
A CO Survey of the LMC with NANTEN: II. Catalog of Molecular Clouds
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与 NANTEN 合作对 LMC 进行的调查：II。
DOI：
10.1093/pasj/53.6.971
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发表时间：
2001
影响因子：
2.3
通讯作者：
Y. Fukui
中科院分区：
文献类型：
--
作者：
N. Mizuno;R. Yamaguchi;A. Mizuno;M. Rubio;R. Abe;H. Saito;T. Onishi;Y. Yonekura;N. Yamaguchi;H. Ogawa;Y. Fukui
利用NANTEN望远镜的CO（J = 1-0）巡天资料，我们给出了大麦哲伦星云中巨分子云（GMCs）的完整目录。总共有107个CO云被识别，其中55个在3个以上的观测位置被检测到。对于55个云，物理性质，如大小，线宽，维里质量，和CO光度，编目。从这些量的统计分析，我们表明，在大麦哲伦星系的GMC接近引力平衡。与H I数据的比较表明，大部分CO云分布在H I气体的稠密部分，其H I柱密度大于1021 cm−2。值得注意的是，气体的较低径向速度分量的分子氢与原子氢的质量比为1.00.2，比气体圆盘分量的质量比1.00.1高2倍。在低速分量中，母原子云中显然有效地形成了分子云。CO弧是星系南部光学边缘沿着几kpc尺度的CO云有序结构，它与H I气体的低速成分有很好的对应关系。
From a CO (J = 1–0) survey with the NANTEN telescope, we present a complete catalog of giant molecular clouds (GMCs) in the Large Magellanic Cloud. In total, 107 CO clouds have been identified, 55 of which were detected at more than 3 observed positions. For the 55 clouds, the physical properties, such as size, line-width, virial mass, and CO luminosity, are cataloged. From a statistical analysis of these quantities, we show that GMCs in the LMC are close to gravitational equilibrium. A comparison with H I data indicates that most of the CO clouds are distributed in dense parts of H I gas, whose H I column density is greater than 1021 cm−2. It is notable that the mass ratio of the molecular-to-atomic hydrogen of the lower radial velocity component of gas is ∼ 0.2, which is a factor of 2 higher than that of the gaseous-disk component, ∼ 0.1. Molecular clouds are apparently formed efficiently in the parent atomic clouds in the lower velocity component. The CO Arc, which is a few kpc scale ordered structure of CO clouds along the southern optical edge of the galaxy, corresponds well to the the lower velocity component of H I gas.