SU, Yu-Nung; LIU, Sheng-Yuan; CHEN, Huei-Ru; TANG, Ya-Wen

doi:10.1088/2041-8205/744/2/L26

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The Astrophysical journal letters. 2012, vol. 744, n° 2, p. 26

Bristol : IOP Publishing

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We have imaged the extremely high-velocity outflowing gas in CO (2-1) and (3-2) associated with the shell-like ultracompact HII region G5.89-0.39 at a resolution of ~3" (corresponding to ~4000 AU) with the Submillimeter Array. The integrated high-velocity (>45 km/s) CO emission reveals at least three blueshifted lobes and two redshifted lobes. These lobes belong to two outflows, one oriented N-S, the other NW-SE. The NW-SE outflow is likely identical to the previously detected Br_gamma outflow. Furthermore, these outflow lobes all clearly show a Hubble-like kinematic structure. For the first time, we estimate the temperature of the outflowing gas as a function of velocity with the large velocity gradient calculations. Our results reveal a clear increasing trend of temperature with gas velocity. The observational features of the extremely high-velocity gas associated with G5.89-0.39 qualitatively favor the jet-driven bow shock model.< Réduire

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H II regions

ISM: individual objects: G5.89-0.39

ISM: jets and outflows

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The Extremely High-Velocity Outflow from the Luminous Young Stellar Object G5.89-0.39

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