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arXiv 2006.01995astro-ph.SRastro-ph.GA
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IRAS 16562 - 3959高质量恒星形成区的化学组成

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

Kotomi Taniguchi, Andrés E. Guzmán, Liton Majumdar, Masao Saito, Kazuki Tokuda

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

分析了阿塔卡马大型毫米/亚毫米波阵列（ALMA）第2周第6波段的数据，该波段指向IRAS 16562 - 3959高质量恒星形成区的G345.4938 + 01.4677大质量年轻原恒星天体（G345.5 + 1.47 MYSO），角分辨率为$\sim 0.3"$，对应于$\sim 760$ au。我们在空间上解决了由三个突出的分子发射核心的中心区域。分别使用H30 $α$线和CH $_{3}$ OH线的零阶矩图像识别超紧凑（HC）H $_{\rm {II}}$区域（核心A）和两个富含分子的核心（核心B和核心C）。在核心B和核心C的位置检测到各种含氧复合有机分子（COMs），如（CH $_{3}$）$_{2}$ CO和CH $_{3}$ OCHO，而在所有核心中检测到含氮物质CH $_{3}$ CN、HC $_{3}$ N及其$^{13}$ C同位素体。通过比较C $^{18}$ O和H $_{2}$ CO的空间分布，讨论了H $_{2}$ CO的形成机制。另一方面，$^{33}$ SO的发射在核A周围呈现环状结构，峰值位于H 30 $α$发射区的外缘。这些结果意味着SO在电离区膨胀运动产生的激波中得到增强。

英文摘要：

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$_{\rm {II}}$ region (Core A) and two molecule-rich cores (Core B and Core C) are identified using the moment zero images of the H30$α$ 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$α$ emission region. These results imply that SO is enhanced in a shock produced by the expanding motion of the ionized region.

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