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The bipolar outflow associated with the Class 0 low-mass protostellar source(IRAS 18148-0440) in L483 has been studied in the CCH and CS line emission at245 and 262 GHz, respectively. Sub-arcsecond resolution observations of theselines have been conducted with ALMA. Structures and kinematics of the outflowcavity wall are investigated in the CS line, and are analyzed by using aparabolic model of an outflow. We constrain the inclination angle of theoutflow to be from 75 degree to 90 degree, i.e. the outflow is blowing almostperpendicular to the line of sight. Comparing the outflow parameters derivedfrom the model analysis with those of other sources, we confirm that theopening angle of the outflow and the gas velocity on its cavity wall correlatewith the dynamical timescale of the outflows. Moreover, a hint of a rotatingmotion of the outflow cavity wall is found. Although the rotation motion ismarginal, the specific angular momentum of the gas on the outflow cavity wallis evaluated to be comparable to or twice that of the infalling-rotatingenvelope of L483.

Sub-arcsecond Kinematic Structure of the Outflow in the Vicinity of the Protostar in L483