115 GHz CO distribution towards the southern Coalsack.

Observations have been made, using the Epping 4-m radio telescope, of emission from the J = 1.0 transition of CO (115 GHz) toward the Southern Coalsack. The half-power beam-width was 2.7 arcmin and the radial velocity resolution was 0.07 km/s. The line was found to be distributed with varying intensity over an area of 63 arcmin x 36 arcmin. The mean radial velocity was - 5.8 km/s and mean half-intensity linewidth 1.18 km/s. A typical line temperature was 8 K with maxima exceeding 12 K. The results suggest a stable dark cloud region with no significant evidence of systematic motions.