Tentative detection of cyanoformamide NCCONH2 in space

IF 2.2 4区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Publications of the Astronomical Society of Japan Pub Date : 2023-12-18 DOI:10.1093/pasj/psad079

Juan Li, Donghui Quan, Junzhi Wang, Xia Zhang, Xing Lu, Qian Gou, Feng Gao, Yajun Wu, Edwin Bergin, Shanghuo Li, Zhiqiang Shen, Fujun Du, Meng Li, Siqi Zheng, Xingwu Zheng

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引用次数: 0

Abstract

The peptide-like molecule cyanoformamide (NCCONH2) is the cyano (CN) derivative of formamide (NH2CHO). It is known to play a role in the synthesis of nucleic acid precursors under prebiotic conditions. In this paper, we present a tentative detection of NCCONH2 in the interstellar medium with the Atacama Large Millimeter/submillimeter Array (ALMA) archive data. 10 unblended lines of NCCONH2 were seen around 3σ noise levels toward Sagittarius B2(N1E), a position that is slightly offset from the continuum peak. The column density of NCCONH2 was estimated to be 2.4 × 1015 cm−2, and the fractional abundance of NCCONH2 toward Sgr B2(N1E) was 6.9 × 10−10. The abundance ratio between NCCONH2 and NH2CHO is estimated to be ∼0.01. We also searched for other peptide-like molecules toward Sgr B2(N1E). The abundances of NH2CHO, CH3NCO and CH3NHCHO toward Sgr B2(N1E) were about 1/10 of those toward Sgr B2(N1S), while the abundance of CH3CONH2 was only 1/20 of that toward Sgr B2(N1S).

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在太空中初步探测到氰甲酰胺 NCCONH2

类肽分子氰甲酰胺（NCCONH2）是甲酰胺（NH2CHO）的氰基（CN）衍生物。众所周知，它在前生物条件下的核酸前体合成中发挥作用。在本文中，我们利用阿塔卡马大型毫米波/亚毫米波阵列（ALMA）的档案数据初步探测到了星际介质中的 NCCONH2。在人马座 B2(N1E)附近的 3σ 噪声水平附近发现了 10 条 NCCONH2 非混合线，该位置与连续波峰值略有偏移。据估计，NCCONH2 的柱密度为 2.4 × 1015 cm-2，射手座 B2(N1E)方向的 NCCONH2 丰度分数为 6.9 × 10-10。据估计，NCCONH2 和 NH2CHO 的丰度比为 ∼0.01。我们还搜索了Sgr B2(N1E)的其他肽类分子。在Sgr B2(N1E)中，NH2CHO、CH3NCO和CH3NHCHO的丰度约为Sgr B2(N1S)的1/10，而CH3CONH2的丰度仅为Sgr B2(N1S)的1/20。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Publications of the Astronomical Society of Japan 地学天文-天文与天体物理

CiteScore

4.10

自引率

13.00%

发文量

审稿时长

4-8 weeks

期刊介绍： Publications of the Astronomical Society of Japan (PASJ) publishes the results of original research in all aspects of astronomy, astrophysics, and fields closely related to them.