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首页> 外文期刊>The Astrophysical Journal. Letters >Interstellar detection of c-C_3D_2
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Interstellar detection of c-C_3D_2

机译:星际探测c-C_3D_2

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We report the first interstellar detection of c-C_3D_2. Doubly deuterated cyclopropenylidene, a carbene, has been detected toward the starless cores TMC-1C and L1544 using the IRAM 30 m telescope. The, 3 _1, 3-2_0, 2, and 2_2, 1-1_1, 0 transitions of this species have been observed at 3 mm in both sources. The expected 1:2 intensity ratio has been found in the 3_0, 3-2 _1, 2 and 3_1, 3-2_0, 2 lines, belonging to the para and ortho species, respectively. We also observed lines of the main species, c-C_3H_2, singly deuterated c-C_3HD, and the species with one ~(13)C off of the principal axis of the molecule, c-H~(13)CC_2H. The lines of c-C_3D_2 have been observed with high signal-to-noise ratio, better than 7.5σ in TMC-1C and 9σ in L1544. The abundance of doubly deuterated cyclopropenylidene with respect to the normal species is found to be 0.4%-0.8% in TMC-1C and 1.2%-2.1% in L1544. The deuteration of this small hydrocarbon ring is analyzed with a comprehensive gas-grain model, the first including doubly deuterated species. The observed abundances of c-C_3D_2 can be explained solely by gas-phase processes, supporting the idea that c-C _3H_2 is a good indicator of gas-phase deuteration.
机译:我们报告了c-C_3D_2的首次星际探测。使用IRAM 30 m望远镜,朝着无星核TMC-1C和L1544检测到双氘化的卡宾环丙烯。在两个来源的3 mm处都观察到该物种的3 _1、3-2_0、2和2_2、1-1_1、0过渡。在3_0、3-2 _1、2和3_1、3-2_0、2行中发现了预期的1:2强度比,分别属于对位和邻位物种。我们还观察到主要物种c-C_3H_2,单氘化的c-C_3HD的谱系以及与分子主轴c-H〜(13)CC_2H偏离一个〜(13)C的物种。已观察到c-C_3D_2的线具有高信噪比,优于TMC-1C中的7.5σ和L1544中的9σ。相对于正常物种,双氘代环丙烯的丰度在TMC-1C中为0.4%-0.8%,在L1544中为1.2%-2.1%。使用全面的气粒模型分析了这个小烃环的氘代,第一个包括双氘代物种。观测到的c-C_3D_2的丰度只能通过气相过程来解释,从而支持c-C _3H_2是气相氘化的良好指示。

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