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SMA Observations of the Hot Molecular Core IRAS 18566+0408

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Abstract

  • 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 × 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 {}12{CO}(2-1), {}13{CO}(2-1), and {SO}({6}5{--}{5}4) lines reveal a molecular outflow at PA ~ 135° centered at the continuum peak. The extended {}12{CO}(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.

Publication Date

  • 2017

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