First Results of a CO Survey of the Large Magellanic Cloud with NANTEN; Giant Molecular Clouds as Formation Sites of Populous Clusters
First Results of a CO Survey of the Large Magellanic Cloud with NANTEN; Giant Molecular Clouds as Formation Sites of Populous Clusters
复制标题
与 NANTEN 联合观测大麦哲伦星云的初步结果；
DOI：
10.1093/pasj/51.6.745
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发表时间：
1999
影响因子：
2.3
通讯作者：
M. Rubio
中科院分区：
文献类型：
--
作者：
Y. Fukui;N. Mizuno;R. Yamaguchi;A. Mizuno;T. Onishi;H. Ogawa;Y. Yonekura;A. Kawamura;K. Tachihara;K. Xiao;N. Yamaguchi;A. Hara;T. Hayakawa;Sigeo Kato;R. Abe;H. Saito;S. Mano;Matsunaga Kenichi;Yoshihiro Mine;Y. Moriguchi;Hiroko Aoyama;S. Asayama;N. Yoshikawa;M. Rubio
利用NANTEN完成了对LMC 2.6 mm一氧化碳排放量的新调查。这项调查发现了107个巨型分子云，这是第一个在单个星系中以~40pC的线性分辨率观测到巨型分子云的完整样本。云质量范围为~6×10~4~2×10~6M®，当分子柱密度为~1.0×10~(21)cm~(-2)时，总分子质量为4~7×10~7M®，相当于原子质量的5~10%。分子云与最年轻的星团表现出良好的空间相关性，表明星团的形成正在进行中。另一方面，它们与较老的星系团或超新星遗迹几乎没有相关性，这表明分子云在几个MyR中正在迅速消散，这可能是由于星系团中大质量恒星的紫外线光子所致。
A new survey of the LMC has been completed in 2.6 mm carbon monoxide emission with NANTEN. This survey has revealed 107 giant molecular clouds, the first complete sample of giant molecular clouds in a single galaxy at a linear resolution of ~ 40 pc. The cloud mass ranges from ~ 6x 10 4 to 2 x 10 6 M®, and the total molecular mass has been estimated to be 4-7 x 10 7 M® for a molecular column density of > 1.0 x 10 21 cm -2 , corresponding to 5-10% of the atomic mass. The molecular clouds exhibit a good spatial correlation with the youngest stellar clusters whose ages are < 10 Myr, demonstrating that cluster formation is on-going in these clouds. On the other hand, they show little correlation with older clusters or with supernova remnants, suggesting that the molecular clouds are being rapidly dissipated in several Myrs, probably due to the UV photons of massive stars in clusters.