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| molecules:ism:c-c3c2h [2022/07/19 10:22] – mueller | molecules:ism:c-c3c2h [2022/07/19 10:39] (current) – mueller |
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| ===== Detection of Ethynylcyclopropynylidyne, c-C3H2H, in the ISM ===== | ===== Detection of Ethynylcyclopropynylidyne, c-C3C2H, in the ISM ===== |
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| C. Cabezas, M. Agúndez, R. Fuentetaja, Y. Endo, N. Marcelino, B. Tercero, J. R. Pardo, P. de Vicente, and J. Cernicharo\\ | C. Cabezas, M. Agúndez, R. Fuentetaja, Y. Endo, N. Marcelino, B. Tercero, J. R. Pardo, P. de Vicente, and J. Cernicharo\\ |
| **[[https://doi.org/10.1051/0004-6361/202244063|Discovery of the Cyclic C<sub>5</sub>H Radical in TMC-1]]**\\ | **[[https://doi.org/10.1051/0004-6361/202244063|Discovery of the Cyclic C<sub>5</sub>H Radical in TMC-1]]**\\ |
| //Astron Astrophys.// **663**, Art. No. L2 (2022).\\ | //Astron Astrophys.// **663**, Art. No. L2 (2022).\\ |
| The //J"// = 5 to 8 transitions between 32.8 and 49.2 GHz were detected in the course of a molecular line survey of the prototypical cold dark molecular cloud TMC-1 carried out with the Yebes 40 m radio telescope. The identity was confirmed through laboratory measurements. The C<sub>3</sub>S to HC<sub>3</sub>S<sup>+</sup> ratio is 65 ± 20, and the HC<sub>3</sub>O<sup>+</sup> to HC<sub>3</sub>S<sup>+</sup> ratio is 1.0 ± 0.5. The C<sub>3</sub>O to C<sub>3</sub>S ratio, in contrast, is ~0.11. | Transitions with //J"// = 4 to 6 and //K<sub>a</sub>// = 1 between 33.0 and 46.4 GHz were detected in the course of a molecular line survey of the prototypical cold dark molecular cloud TMC-1 carried out with the Yebes 40 m radio telescope. Fine structure splitting was resolved throughout, hyperfine splitting in many cases. The rotational temperature was determined as 6.0 ± 0.5 K. The //c//-C<sub>5</sub>H to //l//-C<sub>5</sub>H ratio is about 0.07, very different from the //c//-C<sub>3</sub>H to //l//-C<sub>3</sub>H ratio of ~5.5. |
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