Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 1K053

Extreme High Velocity Components in Quadrupolar Outflow of NGC 1333 IRAS 2A

Tsai, Cheng-Hung (Department of Physics and Institute of Astronomy, National Tsing Hua University)
Chen, Vivien (Department of Physics and Institute of Astronomy, National Tsing Hua University)
Lee, Chin-Fei (Institute of Astronomy & Astrophysics, Academia Sinica )
Hirano, Naomi (Institute of Astronomy & Astrophysics, Academia Sinica )
Shang, Hsien (Institute of Astronomy & Astrophysics, Academia Sinica )

Abstract:
We have mapped a quadrupolar outflow of NGC 1333 IRAS 2A with the Submillimeter Array in CO (2-1) and SiO (5-4) at an angular resolution of 3. The quadrupolar outflow consists of an extended north-south outflow and a collimated east-west outflow. Our observations newly discovered extreme high velocity (EHV) components (≳ 20 km/s) within a north-south wide-angle cavity. These jet-like EHV components are detected near the YSO and outflow vertexes and imply a jet axis along the presumable cavity shell. On the other hand, the east-west outflow shows a bow-shock delineated by standard high velocity (≲ 20 km/s) CO emission and an off-axis EHV component in the west lobe. In the southern EHV component, two distinct kinematic features show an outflow overtaking process with an interface coincided with nearby shocked H2 emission. Considering shock dynamics of these EHV components, we witnessed an ongoing jet interaction with earlier ejected materials and surrounding envelop.

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