Continuum observations of M 17, W 49A and W 51A at 43 GHz.
Abstract
In this paper, 43.3-GHz continuum observations of the Galactic H II regions M17, W49 A, and W51 A are presented. Observations were made with a single-dish of 39-arcsec resolution, and the contour maps were compared with those of 3-mm wavelength results by Gordon et al. (1986). Each resolved area of the sources essentially shows a fairly reasonable thermal spectrum, though there is a weak millimeter-wave intensity excess in the near-south diffuse area of the M17 S-bar. An unfilled concentration of extremely compact and high-density ionized condensations is suggested in this highly obscured area of M17. A morphological similarity between W49 A and W51 A is shown.
- Publication:
-
Publications of the Astronomical Society of Japan
- Pub Date:
- 1989
- Bibcode:
- 1989PASJ...41..809A
- Keywords:
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- Continuous Radiation;
- H Ii Regions;
- Radio Emission;
- Brightness Temperature;
- Cosmic Dust;
- Interstellar Matter;
- Optical Thickness;
- Astrophysics