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

Yu-Nung Su Sheng-Yuan Liu Huei-Ru Chen Ya-Wen Tang 1
1 AMOR 2012
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : 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.
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Contributeur : Marie-Paule Pomies <>
Soumis le : lundi 27 février 2012 - 12:05:18
Dernière modification le : mercredi 27 juillet 2016 - 14:48:48




Yu-Nung Su, Sheng-Yuan Liu, Huei-Ru Chen, Ya-Wen Tang. The Extremely High-Velocity Outflow from the Luminous Young Stellar Object G5.89-0.39. Astrophysical Journal Letters, 2012, 744 (2), pp.26. <10.1088/2041-8205/744/2/L26>. <hal-00674427>



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