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We report molecular line observations of the NGC 1333 IRAS 4C outflow in thePerseus Molecular Cloud with the Atacama Large Millimeter/Submillimeter Array.The CCH and CS emission reveal an outflow cavity structure with clearsignatures of rotation with respect to the outflow axis. The rotation isdetected from about 120 au up to about 1400 au above the envelope/diskmid-plane. As the distance to the central source increases, the rotationvelocity of the outflow decreases while the outflow radius increases, whichgives a flat specific angular momentum distribution along the outflow. The meanspecific angular momentum of the outflow is about 100 au km/s. Based onreasonable assumptions on the outward velocity of the outflow and the protostarmass, we estimate the range of outflow launching radii to be 5-15 au. Such alaunching radius rules out that this outflow is launched as an X-wind, butrather, it is more consistent to be a slow disk wind launched from relativelylarge radii on the disk. The radius of the centrifugal barrier is roughlyestimated, and the role of the centrifugal barrier in the outflow launching isdiscussed.

Rotation in the NGC 1333 IRAS 4C Outflow