Expanding shells of neutral hydrogen around compact H II regions

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Proceedings titleRevista Mexicana de Astronomia y Astrofisica (Conference Series)
ConferenceWinds, Bubbles and Explosions : a conference to honour John Dyson, Sept. 9-13, 2002, Pátzcuaro, Michoacán, Mexico
Pages163165; # of pages: 3
Subjectcircumstellar matter — H II regions
AbstractBy 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.
Publication date
PublisherUniversidad Nacional Autónoma de México
AffiliationNational Research Council Canada; NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number9722504
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Record identifierc0572839-2d7d-4dac-8d68-57078e383f0d
Record created2009-07-17
Record modified2017-05-12
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