Astronomy and Astrophysics – Astronomy
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.4211p&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #42.11; Bulletin of the American Astronomical Society, Vol. 28, p.887
Astronomy and Astrophysics
Astronomy
Scientific paper
We report the results of a search for diffuse Galactic HII regions using radio recombination lines. Unlike previous surveys, which have been directed toward fairly bright, compact radio continuum sources, we observed unprepossessing objects that might be optically obscured analogs to the Rosette nebula, typically a factoor of two fainter in the continuum than could have been detected before. One hundred thirty nebulae have been detected in radio recombination lines for the first time; most require at least one main sequence O star to provide their ionization. The diffuse HII regions appear to have essentially the same distribution in the Galaxy as compact HII regions, and track the surface density of CO fairly closely. There is some indication that the diffuse nebulae have a low abundance of ionized helium, possibly due to their low excitation. We also find that several newly discovered nebulae are associated with peculiar kinematic features in the Galactic nucleus.
Howard Gregory J.
Lockman Felix J.
Pisano Daniel J.
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