Protostars and Planets VI, Heidelberg, July 15-20, 2013
High Mass Star Forming Regions in the Southern Hemisphere
Higuchi, Aya (Joint ALMA Observatory)
Almost all stars in our Galaxy are formed as members of stellar clusters, thus the understanding of cluster formation is one of the crucial issues in astronomy. We have studied 18 young massive clumps, observed radio waves coming from \"dense molecular gas\" surrounding embedded clusters with the Mopra 22m radio telescope. These observations are conducted in the Millimeter Astronomy Legacy Team Survey at 90 GHz (MALT90). From this survey, we have discovered that eight out of 18 objects are associated with WISE 4.6ƒÊm bubbles (CWB: Clump with Bubbles). The rest are not associated with 4.6ƒÊm bubbles (CWOB: Clump without Bubbles) and dark in the WISE 12ƒÊm images. Our results show that CWBs tend to have relatively large velocity widths, which might be related to their formation mechanism or might be effected by their environments. In the future, they will investigate the detailed structures of these objects with ALMA (Atacama Large Millimeter/submillimeter Array).
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