THE EXTREMELY HIGH VELOCITY OUTFLOW FROM THE LUMINOUS YOUNG STELLAR OBJECT G5.89-0.39

Journal Article · Tue Jan 10 04:00:00 EST 2012 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/744/2/L26· OSTI ID:22047229

Su, Yu-Nung; Liu, Sheng-Yuan; Chen, Huei-Ru ^[1]; Tang, Ya-Wen ^[2]

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1. Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 106, Taiwan (China)
2. Observatoire Aquitain des Sciences de l'Univers, Universite de Bordeaux, BP 89, 33271 Floirac (France)

We have imaged the extremely high velocity outflowing gas in CO (2-1) and (3-2) associated with the shell-like ultracompact H II region G5.89-0.39 at a resolution of {approx}3'' (corresponding to {approx}4000 AU) with the Submillimeter Array. The integrated high-velocity ({approx}>45 km s{sup -1}) 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 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.

• OSTI ID: 22047229
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 2 Vol. 744; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ASTROPHYSICS
CARBON MONOXIDE
COSMIC GASES
EMISSION
INTERSTELLAR SPACE
JETS
RESOLUTION
SHOCK WAVES
STARS
VELOCITY