Neutral Hydrogen Observations on H II Regions

Details Neutral Hydrogen Observations on H II Regions Neutral Hydrogen Observations on H II Regions

Sep 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973ap%26ss..24...65b&link_type=abstract

Astrophysics and Space Science, Volume 24, Issue 1, pp.65-82

Astronomy and Astrophysics

Astrophysics

Scientific paper

Nine of the catalogued Hii regions in the southern hemisphere have been selected for correlation with neutral hydrogen observed at the 21 cm line. The radiotelescope used for the Hi line observations was the 30 m Carnegie telescope of the Instituto Argentino de Radioastronomía and the 56 channel, 10 KHz bandwidth receiver. The observational results are analyzed for each Hii region. They are compared with previous optical and radio results. For three of the nine observed regions it has been possible to find neutral hydrogen in absorption with similar velocities. In three cases absorption has been found but no component at the Hii region velocity is seen. Finally in three cases, it has not been possible to find any absorption at all.

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