Identification of the Interstellar 1-cyano propargyl Radical (HCCCHCN) in TMC-1
We report the first detection in interstellar medium of the 1-cyano propargyl radical, HC3HCN. This species is an isomer of the 3-cyano propargyl radical (CH2C3N), 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±0.2)×1011 cm−2 and a rotational temperature of 7±1K. The abundance ratio between HC3HCN and CH2C3N 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 + CH2CHCN and perhaps also in the reaction C2 + CH3CN and the dissociative recombination with electrons of CH2C3NH+
C. Cabezas, M. Agúndez, N. Marcelino, C.H. Chang, R. Fuentetaja, B. Tercero, M. Nakajima, Y. Endo, P. de Vicente, J. Cernicharo
Comments: Accepted as a Letter to the Editor in Astronomy & Astrophysics on December 29th 2024
Subjects: Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2501.01938 [astro-ph.GA] (or arXiv:2501.01938v1 [astro-ph.GA] for this version)
https://doi.org/10.48550/arXiv.2501.01938
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Submission history
From: Carlos Cabezas
[v1] Fri, 3 Jan 2025 18:24:14 UTC (469 KB)
https://arxiv.org/abs/2501.01938
Astrobiology, Astrochemistry,
