Interferometric Observation of the L483 Molecular Core

We present the aperture synthesis imaging of C3H2 2_{12}-1_{01} and HCO+ 1-0lines and of continuum emission at 3.4 mm toward the class 0 young stellarobject, IRAS 18148-0440 in the L483 molecular cloud. The continuum emission isdetected at the IRAS position at a level of 16 mJy, indicating a compact sourcewith a 0.13 solar mass. The C3H2 delineates an envelope near the IRAS position,with a size of 3000 AU x 2000 AU in R.A. and Dec. directions, respectively. Avelocity gradient detected only along the axis of outflow can be explained interms of free-fall motion of the envelope. The HCO+ line wing extends up to thevelocity of +- 6 km s^{-1} relative to the systemic one, and the high velocitymaterial shows a symmetric bipolarity and extends over 2' or 0.1 pc along theeast-west direction. It is found that the outflow material is clumpy and theopening angle is widest for the slowest moving component. The core component ofthe HCO+ 1-0 line exhibits an anti-infall asymmetry not only in interferometricbut also in single dish observations. It is attributable to the slow isotropicoutward motion of gas between the flattened envelope and the collimatedoutflow.Comment: 10pages, 8figures, ApJ accepte