Abstract
By using the 45 m millimeter-wave telescope, we have observed the CO bipolar flow source associated with an infrared source, GL 490, in the J = 1-0 line of carbon monosulfide. The high angular resolution of the telescope, 30'', has allowed us to find a compact CS cloud about 0.3 pc x 0.13 pc in extent around GL 490, which is elongated orthogonally to the direction of the CO bipolar flow. Part of the cloud shows signs of expansion at velocities of < or approx. =4 km s/sup -1/, although the total outgoing momentum of the CS cloud is smaller than that of the CO flow by an order of magnitude. This implies that the CS compact cloud has not been responsible for collimating the bipolar flow in this object.
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