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题名: Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre
作者: Yan, Qing-Zeng; Walsh, A. J.; Dawson, J. R.; Macquart, J. P.; Blackwell, R.; Burton, M. G.; Rowell, G. P.; Zhang, Bo; Xu, Ye; Tang, Zheng-Hong; Hancock, P. J.
刊名: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期: 2017
卷号: 471, 期号:3, 页码:2523-2536
英文摘要: We present a study of the three-dimensional structure of the molecular clouds in the Galactic Centre (GC) using CO emission and OH absorption lines. Two CO isotopologue lines, (CO)-C-12(J = 1 -> 0) and (CO)-C-13(J = 1 -> 0), and four OH ground-state transitions, surveyed by the Southern Parkes Large-Area Survey in Hydroxyl, contribute to this study. We develop a novel method to calculate the OH column density, excitation temperature and optical depth precisely using all four OH lines, and we employ it to derive a three-dimensional model for the distribution of molecular clouds in the GC for six slices in Galactic latitude. The angular resolution of the data is 15.5 arcmin, which at the distance of the GC (8.34 kpc) is equivalent to 38 pc. We find that the total mass of OH in the GC is in the range of 2400-5100 M-circle dot. The face-on view at a Galactic latitude of b = 0 degrees. displays a bar-like structure with an inclination angle of 67.5 +/- 2.1 degrees with respect to the line of sight. No ring-like structure in the GC is evident in our data, likely due to the low-spatial resolution of the CO and OH maps.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17434
Appears in Collections:紫金山天文台青海观测站_期刊论文

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