Observations of 1-millimeter continuum radiation from the DR 21 region.
Abstract
Continuum emission at 1 mm has been mapped with 1-min resolution over a 3-min by 8-min area including the compact H II region DR 21, the maser source W75(S)-OH, and the central portions of the surrounding molecular cloud. Peaks in the 1-mm intensity are observed at the positions of DR 21 and W75(S)-OH, and are roughly coincident with less marked peaks in the intensity of HCN and CO emission. An extended component of 1-mm emission is present as well. The principal source of 1-mm radiation is thought to be thermal emission from dust within the molecular gas. The characteristics of this radiation which make it a promising tool for the study of molecular clouds are briefly discussed.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 1975
- DOI:
- 10.1086/181880
- Bibcode:
- 1975ApJ...199L.185W
- Keywords:
-
- Astronomical Maps;
- Interstellar Gas;
- Masers;
- Millimeter Waves;
- Continuous Radiation;
- H Ii Regions;
- Hydroxyl Emission;
- Microwave Emission;
- Nebulae;
- Astrophysics