Spatial distribution of NH2D in massive star-forming regions

作者：Li, Yuqiang^*; Wang, Junzhi^*; Li, Juan^*; Liu, Shu; Yang, Kai; Zheng, Siqi; Lu, Zhe

来源：Monthly Notices of the Royal Astronomical Society, 2023, 527(3): 5049-5074.

DOI：10.1093/mnras/stad3480

• stars: formation
• stars: massive
• ISM: abundances
• ISM: molecules

To understand the relation between NH2D and its physical environment, we mapped ortho-NH2D 1(11)(s)-1(01)(a) at 85.9 GHz toward 24 Galactic late-stage massive star-forming regions with Institut de Radioastronomie Millimetrique (IRAM) 30-m telescope. Ortho-NH2D 1(11)(s)-1(01)(a) was detected in 18 of 24 sources. Comparing with the distribution of (HCN)-C-13 1-0 as a dense gas tracer and radio recombination line H42 alpha, ortho-NH2D 1(11)(s)-1(01)(a) present complex and diverse spatial distribution in these targets. 11 of the 18 targets, present a different distribution between ortho-NH2D 1(11)(s)-1(01)(a) and (HCN)-C-13 1-0, while no significant difference between these two lines can be found in other 7 sources, mainly due to limited spatial resolution and sensitivity. Moreover, with H42 alpha tracing massive young stellar objects, ortho-NH2D 1(11)(s)-1(01)(a) seems to show a relatively weak emission near the massive young stellar objects.

• 单位
  南京大学; 中国科学院; 广西大学; 中国科学院研究生院; 桂林理工大学