Super-fast Rotation in the OMC 2/FIR 6b Jet

Yuko Matsushita, Satoko Takahashi, Shun Ishii, Kohji Tomisaka, Paul T.P. Ho, John M. Carpenter, Masahiro N. Machida

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


We present Atacama Large Millimeter/submillimeter Array CO (J = 2-1) and 1.3 mm continuum observations of the high-velocity jet associated with the FIR 6b protostar located in the Orion Molecular Cloud-2. We detect a velocity gradient along the short axis of the jet in both the red- and blueshifted components. The position-velocity diagrams along the short axis of the redshifted jet show a typical characteristic of a rotating cylinder. We attribute the velocity gradient in the redshifted component to rotation of the jet. The rotation velocity (>20 km s-1) and specific angular momentum (>1022 cm2 s-1) of the jet around FIR 6b are the largest among all jets in which rotation has been observed. By combining disk wind theory with our observations, the jet launching radius is estimated to be in the range of 2.18-2.96 au. The rapid rotation, large specific angular momentum, and a launching radius far from the central protostar can be explained by a magnetohydrodynamic disk wind that contributes to the angular momentum transfer in the late stages of protostellar accretion.

Original languageEnglish
Article number23
JournalAstrophysical Journal
Issue number1
Publication statusPublished - Jul 20 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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