Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181..703c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 181, Dec. 1977, p. 703-712.
Astronomy and Astrophysics
Astronomy
25
Interstellar Gas, Nebulae, Radio Astronomy, Radio Sources (Astronomy), Astronomical Maps, H Ii Regions, Optical Thickness, Radio Emission, Radio Telescopes, Relief Maps
Scientific paper
Observations of three H II regions located within 2.5 arcmin of the optical nebula K3-50 are described which were performed with the Cambridge 5-km telescope at a frequency of 15.375 GHz and an angular resolution of 0.65 x 1.2 arcsec. Contour maps of the radio features referred to as components A, C1, and C2 are presented and examined. The optical size of K3-50 is discussed along with the radio flux from this nebula, the extinction to the nebula (8.3 magnitudes), and the configuration of ionized gas and molecular clouds in the vicinity of the components. The results show that: (1) the compact core of component A becomes optically thin at 15 GHz, and the radio source is ionization-bounded at least on its eastern edge; (2) the optical object K3-50 is displaced 2 to 3 arcsec from component A, lies in a region of low radio emission, and could be a reflection nebula illuminated by the ionization source of component A; and (3) components C1 and C2 each exhibit a core-envelope structure at 15 GHz and appear to be situated on the far side of a molecular cloud.
Colley D.
Scott Paul F.
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