Molecular line mapping of the giant molecular cloud associated with RCW 106 - III. Multi-molecular line mapping

We present multi-molecular line maps obtained with the Mopra Telescope towards the southern giant molecular cloud (GMC) complex G333, associated with the HII region RCW 106. We have characterised the GMC by decomposing the 3D data cubes with GAUSSCLUMPS, and investigated spatial correlations among different molecules with principal component analysis (PCA). We find no correlation between clump size and line width, but a strong correlation between emission luminosity and line width. PCA classifies molecules into high and low density tracers, and reveals that HCO+ and N2H+ are anti-correlated.Comment: 24 pages, 21 figures accepted by MNRA

RCW 106 Giant Molecular Cloud 13CO mapping (Bains+, 2006)

VizieR On-line Data Catalog: J/MNRAS/367/1609. Originally published in: 2006MNRAS.367.1609BThe data were observed over ~10 weeks during an intermittent observing period that spanned from 2004 July to 2004 October. (3 data files)

RCW 106 Giant Molecular Cloud 13CO mapping (Bains+, 2006)

VizieR On-line Data Catalog: J/MNRAS/367/1609. Originally published in: 2006MNRAS.367.1609BThe data were observed over ~10 weeks during an intermittent observing period that spanned from 2004 July to 2004 October. (3 data files)

Molecular line Mapping of the Giant Molecular Cloud Associated with RCW 106-I : 13CO

We present the first paper in a series detailing the results of 13CO observations of a 1 deg2 region of the giant molecular cloud (GMC) complex associated with the H ii region RCW 106. The 13CO observations are also the first stage of a multimolecular line study of the same region. These observations were amongst the first made using the new on-the-fly mapping capability of the Australia Telescope National Facility Mopra Telescope. In the configuration used, the instrument provided a full width at half-maximum (FWHM) beam size of 33 arcsec and a velocity resolution of 0.17 km s1. The gas emission takes the form of a string of knots, oriented along an axis that extends from the north-west (NW) to the south-east (SE) of the field of the observations, and which is surrounded by a more extended, diffuse emission. We analyse the 2D integrated 13CO emission using the clumpfind algorithm and identify 61 clumps. We compare the gas data in the GMC with the dust data provided by 21-?m Midcourse Space Experiment (MSX) and 1.2-mm Swedish European Southern Observatory Submillimetre Telescope (SEST) images that we both regridded to the cell spacing of the Mopra data and smoothed to the same resolution. The 13CO emission is more diffuse and extended than the dust emission revealed at the latter two wavebands, which both have a much higher contrast between the peaks and the extended emission. From comparison of their centre positions, we find that only 50 per cent of the 13CO clump fits to the data are associated with any dust clumps. Using the clump fits, the total local thermodynamic equilibrium gas mass above the 3? level measured from the molecular data is 2.7 × 105 M, whereas that measured from the smoothed 1.2-mm SEST dust data is 2.2 × 105