The Extremely High-Velocity Outflow from the Luminous Young Stellar Object G5.89-0.39
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.
Keywords
Cite
@article{arxiv.1112.2041,
title = {The Extremely High-Velocity Outflow from the Luminous Young Stellar Object G5.89-0.39},
author = {Yu-Nung Su and Sheng-Yuan Liu and Huei-Ru Chen and Ya-Wen Tang},
journal= {arXiv preprint arXiv:1112.2041},
year = {2015}
}
Comments
14 pages, 4 figures, accepted for publication in ApJ Letters