Hierarchical Structure of HII Regions - Ultracompact, Compact, and Extended Components

Details Hierarchical Structure of HII Regions - Ultracompact, Compact, and Extended Components Hierarchical Structure of HII Regions - Ultracompact, Compact, and Extended Components

2002-04-18

arxiv.org/abs/astro-ph/0204310v1

Astronomy and Astrophysics

Astrophysics

2 pages, To appear in Hot Star Workshop III: The Earliest Phases of Massive Star Birth, ASP Conference Series, 2002, ed. P. A.

Scientific paper

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 problem of UC HII regions and the evolution of HII
regions.

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