MOLECULAR CLOUD CORES IN THE ORION-A CLOUD - II - FCRAO CS(2-1) DATA

CS (2-1) data of the Orion A Cloud obtained with the FCRAO 14 m telesc ope are shown. The CS (2-1) image shows the clumpy and filamentary str ucture of the Orion A cloud, as did our previous CS (1-0) image, obtai ned with the NRO 45 m telescope. The peak intensity T-MB (CS 2-1) decr eases more steeply than T-MB (CS 1-0) toward the south along the filam ent. It is found that the gas density of the CS cores tends to be lowe r in the south of the cloud, and this explains the above difference in the line-intensity decrease. From CS and (CS)-S-34 data, we estimated the optical depth of CS (2-1) to be moderately high (2-5) and that of CS (1-0) to be typically less than unity.