SMA Observations of the Hot Molecular Core IRAS 18566+0408
Journal
Date Issued
2017
Author(s)
Silva, Andrea
•
Zhang, Qizhou
•
Sanhueza, Patricio
•
Lu, Xing
•
•
Fallscheer, Cassandra
•
Beuther, Henrik
•
Sridharan, T. K.
•
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.
Volume
847
Issue
2
Start page
87
Issn Identifier
0004-637X
Ads BibCode
2017ApJ...847...87S
Rights
open.access
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