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SMA Observations of HH 212

Chin-Fei Lee Collaborators: ( CFA ) Paul Ho, Qizhou Zhang, Tyler Bourke, Henrik Beuther ( ASIAA ) Naomi Hirano, Sheng-Yuan Liu, Sienny Shang. SMA Observations of HH 212. Previous Observations. 1.33mm Continuum Observation. Flux density ~ 0.11 Jy Slight elongated Dust opacity  ~ 1

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SMA Observations of HH 212

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  1. Chin-Fei Lee Collaborators: (CFA) Paul Ho, Qizhou Zhang, Tyler Bourke, Henrik Beuther (ASIAA) Naomi Hirano, Sheng-Yuan Liu, Sienny Shang SMA Observations of HH 212

  2. Previous Observations

  3. 1.33mm Continuum Observation • Flux density ~ 0.11 Jy • Slight elongated • Dust opacity ~ 1 • T (dust) ~ 50 K • M ~ 0.08 Msun • Cold, low-mass Class 0 source

  4. C18O J=2-1 Observation • Disk embedded in NH3 Env. • Shell opening to the North? • Differential Rotation • V ~ 0.5 √ (200AU/r) km/s • Central mass ~ 0.07 Msun • Disk mass ~ 0.02 Msun

  5. 13CO J=2-1 Observation • Unresolved narrow waist • Inner part of the rotating disk? • Redshifted dip. Infall? • Shells at the base of the nebulae?

  6. 1.33 mm+C18O+13CO +H2

  7. 12CO J=2-1(Contours) + H2 (Image)

  8. CO Outflow KinematicsA Jet-driven ballistic bow shock model

  9. SO J=6-5 Observation • Shock emission at 70-180 K • Elongated along the jet axis • Knotty shocks near the source? • SK4: Rotation or sideways expansion?

  10. SO +12CO+H2

  11. Conclusions • 1.33 mm: cold, low-mass Class 0 source. • C18O: an edge-on, differentially rotating disk around the source. Angular momentum seems carried inward into the disk from the NH3 envelope. • 13CO: inner part of the disk and shells at the base of the nebulae? • 12CO: shell structures around the H2 jet. H2 bow shocks and CO outflow kinematics are roughly consistent with a jet-driven ballistic bow shock model. • SO: knotty shocks near the source? SK4 -- rotating or expanding?

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