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Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre
Yan, Qing-Zeng1,2,3; Walsh, A. J.2; Dawson, J. R.4,5,6; Macquart, J. P.2; Blackwell, R.7; Burton, M. G.8,9,10; Rowell, G. P.7; Zhang, Bo1; Xu, Ye11; Tang, Zheng-Hong1; Hancock, P. J.2
2017-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume471Issue:3Pages:2523-2536
Abstract

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.

KeywordISM: clouds ISM: kinematics and dynamics ISM: molecules ISM: structure Galaxy: centre Galaxy: kinematics and dynamics
DOI10.1093/mnras/stx1724
WOS KeywordINTERSTELLAR DUST CLOUDS ; EMISSION-ABSORPTION OBSERVATIONS ; MILKY-WAY ; STAR-FORMATION ; PLANE SURVEY ; CO SURVEY ; CENTER REGION ; OH ; BAR ; KINEMATICS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000409035700002
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22677
Collection中国科学院紫金山天文台
Corresponding AuthorYan, Qing-Zeng; Walsh, A. J.; Dawson, J. R.
Affiliation1.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
2.Curtin Univ, Int Ctr Radio Astron Res, GPO Box U1987, Perth, WA 6845, Australia
3.Univ Chinese Acad Sci, 19A Yuquanlu, Beijing 100049, Peoples R China
4.Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia
5.Macquarie Univ, MQ Res Ctr Astron Astrophys & Astrophoton, N Ryde, NSW 2109, Australia
6.CSIRO Astron & Space Sci, Australia Telescope Natl Facil, PO Boc 76, Epping, NSW 1710, Australia
7.Univ Adelaide, Sch Phys Sci, Adelaide, SA 5005, Australia
8.Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
9.Armagh Observ, Coll Hill, Armagh BT61 9DG, North Ireland
10.Planetarium, Coll Hill, Armagh BT61 9DG, North Ireland
11.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Yan, Qing-Zeng,Walsh, A. J.,Dawson, J. R.,et al. Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,471(3):2523-2536.
APA Yan, Qing-Zeng.,Walsh, A. J..,Dawson, J. R..,Macquart, J. P..,Blackwell, R..,...&Hancock, P. J..(2017).Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,471(3),2523-2536.
MLA Yan, Qing-Zeng,et al."Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 471.3(2017):2523-2536.
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