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    Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre

    Access Status
    Fulltext not available
    Authors
    Yan, Q.
    Walsh, A.
    Dawson, J.
    Macquart, Jean-Pierre
    Blackwell, R.
    Burton, M.
    Rowell, G.
    Zhang, B.
    Xu, Y.
    Tang, Z.
    Hancock, Paul
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Yan, Q. and Walsh, A. and Dawson, J. and Macquart, J. and Blackwell, R. and Burton, M. and Rowell, G. et al. 2017. Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre. Monthly Notices of the Royal Astronomical Society. 471 (3): pp. 2523-2536.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stx1724
    http://dx.doi.org/10.1093/mnras/stx1724
    ISSN
    0035-8711
    School
    Department of Physics and Astronomy
    URI
    http://hdl.handle.net/20.500.11937/57869
    Collection
    • Curtin Research Publications
    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, $^{12}$CO ($J$=1$\rightarrow$0) and $^{13}$CO ($J$=1$\rightarrow$0), and four OH ground-state transitions, surveyed by the Southern Parkes Large-Area Survey in Hydroxyl (SPLASH), 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 2400-5100 Solar mass . The face-on view at a Galactic latitude of b = 0{\deg} displays a bar-like structure with an inclination angle of 67.5 $\pm$ 2.1{\deg} 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.

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