Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83..583s&link_type=abstract
Astronomical Journal, vol. 83, June 1978, p. 583-585. NSF-supported research.
Astronomy and Astrophysics
Astronomy
4
Galactic Radiation, Hydrogen Recombinations, Line Spectra, Radiative Recombination, Radio Sources (Astronomy), H Ii Regions, Hydrogen Ions, Radio Astronomy, Spectrum Analysis
Scientific paper
Results are reported for radio observations of the galactic thermal source G37.7 + 0.1, which were made during a recombination-line survey of H II regions with the Arecibo 1000-ft radio telescope using circularly polarized feeds at 1400 and 2371 MHz. The observations indicate double hydrogen recombination lines with a velocity separation of about 40 km/s. Attempts are made to fit the data obtained to three different models which assume: (1) an expanding shell of ionized gas with an expansion velocity of 20 km/s, (2) the chance superposition of two independent H II regions, or (3) a 'core-halo' source configuration with a typical H II region surrounded by a cool partially ionized gas. It is concluded that it is difficult to decide uniquely on a specific model and that CO molecular data would be useful in understanding the precise nature of G37.7 + 0.1.
Silverglate Peter
Terzian Ye.
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