Identification of the interstellar 1-cyano propargyl radical (HCCCHCN) in TMC-1
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866909447771652096 |
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| author | Cabezas, C. Agúndez, M. Marcelino, N. Chang, C. H. Fuentetaja, R. Tercero, B. Nakajima, M. Endo, Y. de Vicente, P. Cernicharo, J. |
| author_facet | Cabezas, C. Agúndez, M. Marcelino, N. Chang, C. H. Fuentetaja, R. Tercero, B. Nakajima, M. Endo, Y. de Vicente, P. Cernicharo, J. |
| contents | We report the first detection in interstellar medium of the 1-cyano propargyl radical, HC$_3$HCN. This species is an isomer of the 3-cyano propargyl radical (CH$_2$C$_3$N), which was recently discovered in TMC-1. The 1-cyano propargyl radical was observed in the cold dark cloud TMC-1 using data from the ongoing QUIJOTE line survey, which is being carried out with the Yebes 40m telescope. A total of seven rotational transitions with multiple hyperfine components were detected in the 31.0-50.4 GHz range. We derived a column density of (2.2$\pm$0.2)$\times$10$^{11}$ cm$^{-2}$ and a rotational temperature of 7$\pm$1\,K. The abundance ratio between HC$_3$HCN and CH$_2$C$_3$N is 1.4. The almost equal abundance of these isomers indicates that the two species may be produced in the same reaction with a similar efficiency, probably in the reaction C + CH$_2$CHCN and perhaps also in the reaction C$_2$ + CH$_3$CN and the dissociative recombination with electrons of CH$_2$C$_3$NH$^+$ |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_01938 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Identification of the interstellar 1-cyano propargyl radical (HCCCHCN) in TMC-1 Cabezas, C. Agúndez, M. Marcelino, N. Chang, C. H. Fuentetaja, R. Tercero, B. Nakajima, M. Endo, Y. de Vicente, P. Cernicharo, J. Astrophysics of Galaxies We report the first detection in interstellar medium of the 1-cyano propargyl radical, HC$_3$HCN. This species is an isomer of the 3-cyano propargyl radical (CH$_2$C$_3$N), which was recently discovered in TMC-1. The 1-cyano propargyl radical was observed in the cold dark cloud TMC-1 using data from the ongoing QUIJOTE line survey, which is being carried out with the Yebes 40m telescope. A total of seven rotational transitions with multiple hyperfine components were detected in the 31.0-50.4 GHz range. We derived a column density of (2.2$\pm$0.2)$\times$10$^{11}$ cm$^{-2}$ and a rotational temperature of 7$\pm$1\,K. The abundance ratio between HC$_3$HCN and CH$_2$C$_3$N is 1.4. The almost equal abundance of these isomers indicates that the two species may be produced in the same reaction with a similar efficiency, probably in the reaction C + CH$_2$CHCN and perhaps also in the reaction C$_2$ + CH$_3$CN and the dissociative recombination with electrons of CH$_2$C$_3$NH$^+$ |
| title | Identification of the interstellar 1-cyano propargyl radical (HCCCHCN) in TMC-1 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2501.01938 |