Expanding Shells of Neutral Hydrogen around Compact H II Regions

Details Expanding Shells of Neutral Hydrogen around Compact H II Regions Expanding Shells of Neutral Hydrogen around Compact H II Regions

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003rmxac..15..163k&link_type=abstract

Winds, Bubbles, and Explosions: a conference to honor John Dyson, Pátzcuaro, Michoacán, México, September 9-13, 2002 (Eds. S. J.

Astronomy and Astrophysics

Astronomy

Circumstellar Matter, H Ii Regions

Scientific paper

By comparing radial velocities of radio-bright compact H II regions with their H I absorption spectra, we have discovered expanding shells of neutral hydrogen around them. These shells are revealed by absorption of the radio continuum emission from the H II regions at velocities indicating greater distances than the observed radial velocity. We believe that these shells are shock zones at the outer edges of the expanding ionized regions.

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