Chemical composition in the IRAS 16562--3959 high-mass star-forming region

Abstract

We have analyzed the Atacama Large Millimeter/submillimeter Array (ALMA) cycle 2 data of band 6 toward the G345.4938+01.4677 massive young protostellar object (G345.5+1.47 MYSO) in the IRAS 16562--3959 high-mass star-forming region with an angular resolution of $\sim 0.3"$, corresponding to $\sim 760$ au. We spatially resolve the central region which consists of three prominent molecular emission cores. A hypercompact (HC) H${}_{\mathrm{II}}$ region (Core A) and two molecule-rich cores (Core B and Core C) are identified using the moment zero images of the H30$\alpha$ line and a CH${}_3$OH line, respectively. Various oxygen-bearing complex organic molecules (COMs), such as (CH${}_3$)${}_2$CO and CH${}_3$OCHO, have been detected toward the positions of Core B and Core C, while nitrogen-bearing species, CH${}_3$CN, HC${}_3$N and its ${}^{13}$C isotopologues, have been detected toward all of the cores. We discuss the formation mechanisms of H${}_2$CO by comparing the spatial distribution of C${}^{18}$O with that of H${}_2$CO. The ${}^{33}$SO emission, on the other hand, shows a ring-like structure surrounding Core A, and it peaks on the outer edge of the H30$\alpha$ emission region. These results imply that SO is enhanced in a shock produced by the expanding motion of the ionized region.

21 pages, 13 figures, 6 tables, Accepted by The Astrophysical Journal

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