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Occurrence Frequency of CO Outflows in Massive Protostellar Candidates
Kee-Tae Kim, S. E. Kurtz
We mapped 12 massive protostellar candidates in the CO J=2-1 line, which in combination with Zhang et al. (2005) completes an unbiased survey of outflows for all 48 sources with l>…
Molecular Counterparts of Ultracompact HII Regions with Extended Envelopes
Kee-Tae Kim, Bon-Chul Koo
We carried out 13CO J=1-0, CS, and C34S J=2-1 and J=3-2 line observations of molecular clouds associated with 16 ultracompact (UC) HII regions with extended envelopes. The molecula…
Hierarchical Structure of HII Regions - Ultracompact, Compact, and Extended Components
Kee-Tae Kim, Bon-Chul Koo
We have observed extended emission physically associated with 15 out of 16 UC HII regions with large ratios of single-dish to VLA fluxes. We discuss their implications for the age…
Infrared Excess and Molecular Gas in Galactic Supershells
Jeong-Eun Lee, Kee-Tae Kim, Bon-Chul Koo
We have carried out high-resolution observations along one-dimensional cuts through the three Galactic supershells GS 064-01-97, GS 090-28-17, and GS 174+02-64 in the HI 21 cm and…