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Paper: Hierarchical Structure of HII regions - Ultracompact Compact, and Extended Components
Volume: 267, Hot Star Workshop III: the Earliest Stages of Massive Star Birth
Page: 373
Authors: Kim, K.-T.; Koo, B.-C.
Abstract: We have observed extended emission physically associated with 15 out of 16 UCHII regions with large ratios of single-dish to VLA fluxes. We discuss their implications for the age problem of UCHII regions and the evolution of HII regions.
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