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Mapping Observations of Peptide-like Molecules around Sagittarius B2

文献类型：期刊论文

作者Zheng, Siqi3,4,5; Li, Juan3,4; Wang, Junzhi6; Wang, Yao8; Gao, Feng7,11; Quan, Donghui9,10; Du, Fujun1,8; Wu, Yajun3,4; Bergin, Edwin2; Li, Yuqiang3,4,5
刊名ASTROPHYSICAL JOURNAL
出版日期2024
卷号961期号:1页码:58
ISSN号0004-637X
DOI10.3847/1538-4357/ad072c
产权排序8
英文摘要Peptide-like molecules, which have a close connection with the origin of life, have been detected in the Universe. Mapping observations of HCONH2 and CH3CONH2, two of the simplest peptide-like molecules, are performed toward the Sagittarius B2 (Sgr B2) complex with the IRAM 30 m telescope. Seven transitions of HCONH2 and five transitions of CH3CONH2 are used in the analysis. The spatial distributions of the excitation temperature and column density of HCONH2 in the molecular envelope of Sgr B2 are obtained by rotation diagrams. Assuming the same excitation temperature of HCONH2, the column densities of CH3CONH2 are also calculated. The results show that the excitation temperature ranges from 6 to 46 K in the molecular envelope of Sgr B2. The abundance ratios between HCONH2 and CH3CONH2 are calculated to explore the relationship between them, as are those between HCONH2 and HNCO. The abundance ratio of CH3CONH2/HCONH2 varies from 10% to 20%, while that of HCONH2/HNCO ranges from 1.5% to 10%. CH3CONH2 is enhanced with respect to HCONH2 in the northwest region of Sgr B2. One transition of H13CONH2 is detected toward 12 positions of Sgr B2, from which a 12C/13C ratio of 28.7 is obtained. A time-dependent chemical model with a short-duration X-ray burst is used to explain the observed abundances of HCONH2 and CH3CONH2, with the best-fitting result at T dust = 53-56 K. More chemical reactions are required to be included in the model since the modeled abundance is lower than the observed one at the observed T dust.
WOS关键词COMPLEX ORGANIC-MOLECULES ; STAR-FORMING REGIONS ; GAS-PHASE FORMATION ; BINDING-ENERGIES ; GALACTIC-CENTER ; HOT CORES ; INTERSTELLAR DETECTION ; LINE SURVEY ; WATER ICE ; CHEMISTRY
资助项目MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[2022YFA1603101] ; MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166[170-18] ; National Key R&D Program of China ; INSU/CNRS (France) ; MPG (Germany) ; IGN (Spain)[BK20221163] ; Natural Science Foundation of Jiangsu Province
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001142532200001
出版者IOP Publishing Ltd
资助机构MOST divided by National Key Research and Development Program of China (NKPs)https://doi.org/10.13039/501100012166 ; National Key R&D Program of China ; INSU/CNRS (France) ; MPG (Germany) ; IGN (Spain) ; Natural Science Foundation of Jiangsu Province
源URL[http://ir.xao.ac.cn/handle/45760611-7/5715]  
专题天体化学研究团组
通讯作者Zheng, Siqi; Li, Juan; Wang, Junzhi
作者单位1.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China
2.Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA
3.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210033, Peoples R China
5.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
6.Guangxi Univ, Dept Phys, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
7.Univ Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany
8.Chinese Acad Sci, Purple Mt Observ, 10 Yuanhua Rd, Nanjing 210023, Peoples R China
9.Zhejiang Lab, Res Ctr Intelligent Comp Platforms, Hangzhou 311100, Peoples R China
10.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China
推荐引用方式
GB/T 7714		 Zheng, Siqi,Li, Juan,Wang, Junzhi,et al. Mapping Observations of Peptide-like Molecules around Sagittarius B2[J]. ASTROPHYSICAL JOURNAL,2024,961(1):58.
APA Zheng, Siqi.,Li, Juan.,Wang, Junzhi.,Wang, Yao.,Gao, Feng.,...&Li, Yuqiang.(2024).Mapping Observations of Peptide-like Molecules around Sagittarius B2.ASTROPHYSICAL JOURNAL,961(1),58.
MLA Zheng, Siqi,et al."Mapping Observations of Peptide-like Molecules around Sagittarius B2".ASTROPHYSICAL JOURNAL 961.1(2024):58.

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