Interaction between the Infalling Rotating Envelope and Bending Outflow in the Extremely Young Class 0 Protostar L1451-mm

Shu Ishibashi  (Kagoshima University)

We present results of the ALMA Band 6 data analysis of the extremely young Class 0 protostar, L1451-mm, at an angular resolution of 150 au. We found that both the 12CO (J=2—1) and SiO (J=5—4) images show bending outflow features with the maximum length of ~600 au. Furthermore, the SiO emission at higher velocities (1.0 km s-1) exhibits a tighter bending morphology with the angle between the blue- and redshifted components of ~100 deg, while the SiO emission at lower velocities shows a moderate bending. The N2D+ (J=3—2) image reveals a ~700 au scale, cold molecular gas associated with the protostar, elongated perpendicular to the outflow. The spatial and velocity features of the N2D+ emission can be interpreted as a rotating and infalling gas motion. The presence of the SiO emission indicates that the outflow is interacting with and disrupting the infalling envelope. In this presentation we will show these images and discuss implications from these results.