Comparison of radio and optical studies in a region of the Southern Coalsack
Abstract
Detailed observations of the 4830 MHz formaldehyde absorption and the 1667 OH emission have been made in the direction of a region in the Southern Coalsack. These are compared with an optical study of the same region, which contains several dark globules for which the interstellar extinction is estimated to be high (>10 mag). The formaldehyde distribution is found to agree quite well with that of the dense globules, whilst the O distribution although more widespread still agrees closely with the formaldehyde and dust distribution. Assuming a simple model for the globule complex, we have determined transition temperatures and optical depths for each species. From these parameters, estimates of the column density for both the formaldehyde and OH clouds are made.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- April 1976
- DOI:
- 10.1093/mnras/175.1.117
- Bibcode:
- 1976MNRAS.175..117B