Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....38..109w&link_type=abstract
Astronomy and Astrophysics, vol. 38, no. 1, Jan. 1975, p. 109-128.
Astronomy and Astrophysics
Astronomy
66
Astronomical Models, Brightness Temperature, Galactic Radiation, H Ii Regions, Hydrogen Ions, Microwave Emission, Radio Sources (Astronomy), Apertures, Electron Density (Concentration), Fine Structure, Hydroxyl Emission, O Stars, Radiation Distribution, Radio Astronomy, Stellar Evolution
Scientific paper
Aperture synthesis observations at 2.695 GHz and 8.085 GHz of the H II regions NRAO 591, NGC 6857, NGC 7538, M8, W3 and W49A made with the NRAO interferometer are presented. A set of Gaussian functions is derived to describe the radiation distribution of each H II region at each frequency. Fine structure is found in all regions. With the exception of the extended source in W49A, all previously known sources with high excitation parameters are resolved into smaller sources. The electron densities of individual sources range from 100 per cu cm up to 100,000 per cu cm. In NGC 6857, NGC 7538 and W49A, continuum sources smaller than 4 arc sec and with electron densities exceeding 10,000 per cu cm are found close to the known class II OH emission sources. In M8, we find a ring which seems to be split at the position of the O-star Herschel 36.
Altenhoff Wilhelm J.
Webster William J. Jr.
Wink Jörn E.
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