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arXiv 2609.30654astro-ph.GAastro-ph.SR

富含氰基多炔但缺乏复杂有机分子的大质量原恒星:首个热碳链化学源 G28.28-0.36

A Cyanopolyyne-rich but COM-poor Massive Protostar: The First Hot Carbon Chain Chemistry Source G28.28-0.36

Kotomi Taniguchi, Masao Saito, Prasanta Gorai, Olli Sipilä, Kazuhito Dobashi, Paola Caselli, Tirupati Kumara Sridharan, Tomomi Shimoikura, Jonathan C. Tan

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中文总结 AI 辅助

本研究利用ALMA数据发现大质量原恒星G28.28-0.36富含氰基多炔但缺乏复杂有机分子,证实其为首个热碳链化学源,对应低质量源L1527。

中文摘要 AI 辅助

我们展示了利用阿塔卡马大型毫米/亚毫米波阵列(ALMA)第3波段对大质量年轻恒星天体(MYSO)G28.28-0.36(简称G28.28)获得的分子发射线数据。从MYSO G28.28中探测到了氰基多炔(HC$_3$N和HC$_5$N)以及三种复杂有机分子(COMs;CH$_3$OH、CH$_3$CN和CH$_3$CHO)。此外,在G28.28与邻近的致密H II区之间识别出了氰基多炔的强发射区域。HC$_5$N发射与尘埃连续谱峰值位置重合,在此处根据CH$_3$CN推导出的激发温度为100 K。这些结果表明,热碳链化学(HCCC)机制在G28.28周围的热区域产生了氰基多炔。我们发现G28.28展现出独特的化学特征:氰基多炔丰度高,但复杂有机分子缺乏,这与先前研究的其他MYSO不同。这些结果暗示G28.28是暖碳链化学(WCCC)低质量源L1527的对应天体。G28.28是目前已识别的首个HCCC源。

英文摘要

We present molecular emission line data from the massive young stellar object (MYSO) G28.28-0.36 (G28.28) obtained with the Atacama Large Millimeter/submillimeter Array Band 3. Cyanopolyynes (HC$_3$N and HC$_5$N) and three complex organic molecules (COMs; CH$_3$OH, CH$_3$CN, and CH$_3$CHO) are detected from the MYSO G28.28. In addition, strong emission regions of cyanopolyynes are identified between G28.28 and a nearby ultracompact H II region. The HC$_5$N emission is coincident with the dust continuum peak, where an excitation temperature of 100 K is derived from CH$_3$CN. These results suggest that the Hot Carbon Chain Chemistry (HCCC) mechanism produces cyanopolyynes in the hot region around G28.28. We find that G28.28 exhibits a unique chemical feature: cyanopolyynes are abundant, but COMs are deficient, unlike the other MYSOs studied previously. These results imply that G28.28 is a counterpart of the Warm Carbon Chain Chemistry (WCCC) low-mass source L1527. G28.28 is the first HCCC source identified so far.

发表机构

  • National Astronomical Observatory of Japan(日本国立天文台)
  • The Graduate University for Advanced Studies, SOKENDAI(综合研究大学院大学)
  • Rosseland Centre for Solar Physics, University of Oslo(奥斯陆大学罗斯达尔太阳物理中心)
  • Institute of Theoretical Astrophysics, University of Oslo(奥斯陆大学理论天体物理研究所)
  • Universität Heidelberg, Zentrum für Astronomie, Institut für Theoretische Astrophysik(海德堡大学天文学中心理论天体物理研究所)
  • Max-Planck-Institut für Extraterrestrische Physik(马克斯·普朗克地外物理学研究所)
  • Tokyo Gakugei University(东京学艺大学)

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