A study of dense cloud cores and star formation in Lupus
A study of dense cloud cores and star formation in Lupus
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狼疮中致密云核和恒星形成的研究
DOI：
10.1093/pasj/51.6.895
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
康雄 福井
中科院分区：
文献类型：
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作者：
A. Hara;K. Tachihara;T. Onishi;A. Mizuno;Y. Fukui;研悟 立原;利和 大西;亮 水野;康雄 福井
我们对狼座暗云复合体的致密云核和星星形成进行了广泛的研究。利用名古屋大学Las Campanas天文台的4米毫米波望远镜“NANTEN”对2.6毫米波长的C180（J = 1-0）辐射进行了毫米波观测。在C180发射中以2'网格间距用2.7束确定并绘制了36个致密核。C180核心的典型质量、半径、H2柱密度和线宽分别为9.7M ®、0.17pc、4.1 × 1021 cm-2、0.90km s-1。C1810核的质谱通过单一幂律指数拟合，其中M核> 3 M®。导出了致密C180岩心的物理参数，并与金牛座、蛇夫座和L1333岩心的物理参数进行了比较。虽然金牛座的C180核在谱线宽度、维里比和质谱指数等方面存在差异，但狼疮的C180核的平均特征与蛇夫座和L 1333的相似。通过比较狼疮C18 0核的物理性质与YSO和H13 CO +凝聚的分布，我们证实了以前研究中提出的一种趋势，即星星的形成优先发生在具有较小维里比（Mvir/M core）和较大H2柱密度的核中。
We have made an extensive study of dense cloud cores and star formation in the Lupus dark-cloud complex. Millimeter-wave observations in the C 18 0 (J = 1-0) emission at 2.6 mm wavelength were made with the "NANTEN," a 4-m mm-wave telescope of Nagoya University at Las Campanas Observatory. Thirty-six dense cores were identified and mapped in the C 18 0 emission at 2' grid spacing with a 2.7 beam. The typical mass, radius, H 2 column density, and line width of the C 18 0 cores are 9.7 M®, 0.17 pc, 4.1 x 10 21 cm -2 , 0.90 km s" 1 , respectively. The mass spectrum of the C 18 0 cores was fitted by a single power-law index of 7 = -1.7 ±0.6 for M core > 3 M®. The physical parameters of the dense C 18 0 cores were derived and compared with those in Taurus, Ophiuchus North, and L 1333. The average characteristics of the C 18 0 cores in Lupus are similar to those in Ophiuchus North and L 1333, although those in Taurus are found to be different, especially in the line width, virial ratio, and mass spectrum index among the four regions. By comparing the physical properties of the C 18 0 cores with the distribution of YSOs and H 13 CO + condensations in Lupus, we have confirmed a trend suggested in previous studies, that star formation preferentially occurs in cores having a small virial ratio, M vir /M core , and a large H2 column density.