Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre
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 S...
| Main Authors: | , , , , , , , , , , |
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| Format: | Journal Article |
| Published: |
Oxford University Press
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/57869 http://dx.doi.org/10.1093/mnras/stx1724 |
| _version_ | 1848760119045652480 |
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| author | Yan, Q. Walsh, A. Dawson, J. Macquart, Jean-Pierre Blackwell, R. Burton, M. Rowell, G. Zhang, B. Xu, Y. Tang, Z. Hancock, Paul |
| author_facet | Yan, Q. Walsh, A. Dawson, J. Macquart, Jean-Pierre Blackwell, R. Burton, M. Rowell, G. Zhang, B. Xu, Y. Tang, Z. Hancock, Paul |
| author_sort | Yan, Q. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T10:10:42Z |
| format | Journal Article |
| id | curtin-20.500.11937-57869 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:10:42Z |
| publishDate | 2017 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-578692019-02-19T05:35:55Z Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre Yan, Q. Walsh, A. Dawson, J. Macquart, Jean-Pierre Blackwell, R. Burton, M. Rowell, G. Zhang, B. Xu, Y. Tang, Z. Hancock, Paul 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. 2017 Journal Article http://hdl.handle.net/20.500.11937/57869 10.1093/mnras/stx1724 http://dx.doi.org/10.1093/mnras/stx1724 Oxford University Press restricted |
| spellingShingle | Yan, Q. Walsh, A. Dawson, J. Macquart, Jean-Pierre Blackwell, R. Burton, M. Rowell, G. Zhang, B. Xu, Y. Tang, Z. Hancock, Paul Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre |
| title | Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre |
| title_full | Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre |
| title_fullStr | Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre |
| title_full_unstemmed | Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre |
| title_short | Towards a three-dimensional distribution of the molecular clouds in the Galactic Centre |
| title_sort | towards a three-dimensional distribution of the molecular clouds in the galactic centre |
| url | http://hdl.handle.net/20.500.11937/57869 http://dx.doi.org/10.1093/mnras/stx1724 |