Astrophys. J., 847, 87-87 (2017/October-1)
SMA observations of the hot molecular core IRAS 18566+0408.
SILVA A., ZHANG Q., SANHUEZA P., LU X., BELTRAN M.T., FALLSCHEER C., BEUTHER H., SRIDHARAN T.K. and CESARONI R.
Abstract (from CDS):
We present Submillimeter Array (SMA) observations toward the high-mass star-forming region IRAS 18566+0408. Observations at the 1.3 mm continuum and in several molecular line transitions were performed in the compact (2.''4 angular resolution) and very-extended (∼0.''4 angular resolution) configurations. The continuum emission from the compact configuration shows a dust core of 150 M☉, while the very-extended configuration reveals a dense (2.6 x 107 cm–3) and compact (∼4000 au) condensation of 8 M☉. We detect 31 molecular transitions from 14 species including CO isotopologues, SO, CH3OH, OCS, and CH3CN. Using the different k-ladders of the CH3CN line, we derive a rotational temperature at the location of the continuum peak of 240 K. The 12CO(2-1), 13CO(2-1), and SO(65–54) lines reveal a molecular outflow at PA ∼ 135° centered at the continuum peak. The extended 12CO(2-1) emission has been recovered with the IRAM 30 m telescope observations. Using the combined data set, we derive an outflow mass of 16.8 M☉. The chemically rich spectrum and the high rotational temperature confirm that IRAS 18566+0408 is harboring a hot molecular core. We find no clear velocity gradient that could suggest the presence of a rotational disk-like structure, even at the high-resolution observations obtained with the very-extended configuration.
© 2017. The American Astronomical Society. All rights reserved.
ISM: individual objects: IRAS 18566+0408 - ISM: jets and outflows - ISM: kinematics and dynamics - stars: formation - stars: massive - stars: massive
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