Mopra observations of G305.2+0.2: massive star formation at different evolutionary stages?

Walsh, A.J., and Burton, M.G. (2006) Mopra observations of G305.2+0.2: massive star formation at different evolutionary stages? Monthly Notices of the Royal Astronomical Society, 365 (1). pp. 321-326.

[img] PDF (Published Version)
Restricted to Repository staff only

View at Publisher Website:


We have successfully used a new on-the-fly mapping technique with the Mopra radio telescope to image G305.2+0.2 in transitions of 13CO, HCO+, N2H+, CH3CN and CH3OH. All these species appear to be concentrated towards the infrared-quiet methanol maser site G305A (G305.21+0.21). We suggest that this region contains an extremely deeply embedded site of massive star formation, with comparable qualities to the low-mass Class 0 stage. The infrared bright methanol maser site G305B (G305.21+0.20) also exhibits emission in all the mapped transitions, but always at a lower level.We suggest this is because it harbours a site of massive star formation older and more developed than G305.21+0.21. All transitions appear to be extended beyond the size of the Mopra beam (30 arcsec). 13CO and HCO+ line wings are suggestive of an outflow in the region, but the spatial resolution of these data is insufficient to identify the powering source. A narrow-lined (1.6 km s−1 compared to a typical line FWHM of 6.4 km s−1) N2H+ source (G305SW) is found 90 arcsec to the south-west of the main star-forming centres, which does not correspond to any CH3CN or CH3OH source, nor does it correspond well to 13CO or HCO+ emission in the vicinity.We suggest this may be a massive, cold, quiescent and possibly pre-stellar core.

Item ID: 9090
Item Type: Article (Research - C1)
ISSN: 1365-2966
Keywords: masers; stars; formation; ISM; molecules; infrared:
Date Deposited: 18 Mar 2010 00:40
FoR Codes: 02 PHYSICAL SCIENCES > 0201 Astronomical and Space Sciences > 020104 Galactic Astronomy @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
Downloads: Total: 1
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page