ALMA Observations toward the S-shaped Outflow and the Envelope around NGC 1333 IRAS 4A2

We have analyzed the ALMA archival data of SO (JN = 65 − 54 and JN 76 65), CO (J 2 1), CCH (N 3 2, J 7/2 5/2, F 4 3) lines from Class 0 protobinary system, NGC 1333 IRAS 4A. The images 54) 1) successfully separate two northern outflow lobes connected to each protostar, 4A1 4A2. 4A2 shows an S-shaped morphology, consisting a flattened envelope around with both edges envelope. surrounding has velocity gradient opposite that circumbinary observed features are reproduced by magnetohydrodynamic simulation collapsing core whose magnetic field direction is misaligned rotational axis. Our intensity enhanced on one side, resulting in formation morphology. can also be explained precessing launched unresolved binary separation larger than 12 au (004). Additionally, we discovered previously unknown extremely high-velocity component at ∼45–90 km s−1 near CO. (JN,F 7/23,4 5/22,3) emission pairs blobs attached bottom shell-like feature, morphology significantly different lines. Toward 4A2, shown overlapped shells, while shells gradients those structure