期刊
ASTRONOMY & ASTROPHYSICS
卷 390, 期 1, 页码 337-350出版社
E D P SCIENCES
DOI: 10.1051/0004-6361:20020671
关键词
ISM : circumstellar matter; ISM : HII regions; ISM : kinematics and dynamics
By comparing radial velocities of radio bright compact H II regions with their Hi absorption profiles, we 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 edge of the expanding ionized region. Additionally we found evidence for a velocity inversion inside the Perseus arm caused by a spiral shock, which results in a deep absorption line in the spectra of compact H II regions behind it.
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