http://arxiv.org/abs/1604.05789
The massive molecular outflows erupting from the high-mass young stellar objects provide important clues to understand the mechanism of the high-mass star formation. Based on new CO J=3-2 and J=1-0 observations with ASTE and Mopra, we discovered a new and very young massive bipolar outflow associated with the dense dust core AGAL G337.916-00.477 (AGAL337.9-S), located at 3.2kpc. The outflow is very compact less than 1,pc and is not fully resolved in the angular resolutions of ASTE and Mopra. The maximum velocities of the outflow lobes are as high as 30-40km/s. The total source luminosity for AGAL337.9-S was estimated to be ~10^5 Lo. Compared with the other massive outflows, we concluded that the AGAL337.9-S outflow is certainly one of the most massive and youngest high-mass young stellar objects ever known in the Milky Way. The short dynamical timescale ~10^4yrs of the outflow and mid-infrared-faint spectral energy distribution of AGAL337.9-S support for its young age. We also found that another dust core AGAL G337.922-00.456 (AGAL337.9-N) at 0.2 degree north of AGAL337.9-S is also a high-mass young stellar object in an earlier evolutional stage than AGAL337.9-S, although it is less bright in infrared than AGAL337.9-S. These two dense cores are embedded at the western rim of the galactic HII region G337.90-00.50, and we discussed that the formation of AGAL337.9-S and AGAL337.9-N and their star formation were not triggered by the interaction with G337.90-00.50 and that they were formed before the birth of the exciting high-mass star(s) of G337.90-00.50.
K. Torii, Y. Hattori, K. Hasegawa, et. al.
Thu, 21 Apr 16
38/61
Comments: 12 pages, 5 figures, 3 tables, submitted to ApJ
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