The ALMA-QUARKS survey: Extensive detection of acetamide in multiple high-mass star-forming regions
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arXiv
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| Auteurs principaux: | , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915500214190080 |
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| author | Duan, Chunguo Xu, Xuefang Gou, Qian Liu, Tie Pagani, Laurent Xu, Fengwei Wang, Ke Liu, Xunchuan Kang, Jun He, Mingwei Jiao, Jiaxiang |
| author_facet | Duan, Chunguo Xu, Xuefang Gou, Qian Liu, Tie Pagani, Laurent Xu, Fengwei Wang, Ke Liu, Xunchuan Kang, Jun He, Mingwei Jiao, Jiaxiang |
| contents | Acetamide (CH$_{3}$CONH$_{2}$), a key interstellar amide and a methyl derivative of formamide (NH$_{2}$CHO), has been sparsely detected, limiting insights into its prebiotic relevance. We present the first systematic survey for acetamide toward 52 hot molecular cores using ALMA Band 6 data. Acetamide has been detected in 10 cores, markedly expanding the inventory of known emitters. The derived column densities of acetamide range from $(2.5\pm0.9)\times10^{14}$ to $(1.5\pm0.6)\times10^{16}$ cm$^{-2}$, compared to formamide's $(1.1\pm0.1)\times10^{15}$ to $(6.9\pm0.4)\times10^{16}$ cm$^{-2}$. The nearly constant abundance ratios (~3-9) and strong abundance correlation between the two amides across sources suggest a chemically linked formation pathway, likely on grain surfaces. The presence of peptide-like molecules in these regions implies that complex organic species can survive star formation processes, offering a potential pathway toward prebiotic chemistry. These findings constrain the dominant grain surface formation routes of acetamide, confirm its broader prevalence in highmass star-forming regions, and underscore the importance of targeted amide surveys in tracing the chemical evolution toward prebiotic complexity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_01904 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The ALMA-QUARKS survey: Extensive detection of acetamide in multiple high-mass star-forming regions Duan, Chunguo Xu, Xuefang Gou, Qian Liu, Tie Pagani, Laurent Xu, Fengwei Wang, Ke Liu, Xunchuan Kang, Jun He, Mingwei Jiao, Jiaxiang Astrophysics of Galaxies Acetamide (CH$_{3}$CONH$_{2}$), a key interstellar amide and a methyl derivative of formamide (NH$_{2}$CHO), has been sparsely detected, limiting insights into its prebiotic relevance. We present the first systematic survey for acetamide toward 52 hot molecular cores using ALMA Band 6 data. Acetamide has been detected in 10 cores, markedly expanding the inventory of known emitters. The derived column densities of acetamide range from $(2.5\pm0.9)\times10^{14}$ to $(1.5\pm0.6)\times10^{16}$ cm$^{-2}$, compared to formamide's $(1.1\pm0.1)\times10^{15}$ to $(6.9\pm0.4)\times10^{16}$ cm$^{-2}$. The nearly constant abundance ratios (~3-9) and strong abundance correlation between the two amides across sources suggest a chemically linked formation pathway, likely on grain surfaces. The presence of peptide-like molecules in these regions implies that complex organic species can survive star formation processes, offering a potential pathway toward prebiotic chemistry. These findings constrain the dominant grain surface formation routes of acetamide, confirm its broader prevalence in highmass star-forming regions, and underscore the importance of targeted amide surveys in tracing the chemical evolution toward prebiotic complexity. |
| title | The ALMA-QUARKS survey: Extensive detection of acetamide in multiple high-mass star-forming regions |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2509.01904 |