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Título: | Discovery of C5H+and detection of C3H+in TMC-1 with the QUIJOTE line survey |
Autor: | Cernicharo, José CSIC ORCID ; Agúndez, Marcelino CSIC ORCID; Cabezas, Carlos CSIC ORCID; Fuentetaja, R. CSIC ORCID; Tercero, Belén CSIC ORCID; Marcelino, Nuria CSIC ORCID; Endo, Y.; Pardo Carrión, Juan Ramón CSIC ORCID ; Vicente, P. de | Fecha de publicación: | 24-ene-2022 | Editor: | Springer Nature | Citación: | Astronomy and Astrophysics 657: L16 (2022) | Resumen: | We report the discovery of the C5H+ cation toward TMC-1 with the QUIJOTE line survey. Four lines from J = 7 - 6 up to J = 10 - 9 have been identified in perfect harmonic frequency relation that can be fit with B = 2411.94397 ± 0.00055 MHz and D = 138 ± 3 Hz. The standard deviation of the fit is 4.4 kHz. After discarding potential candidates, C5H- among them, we conclude that the carrier is C5H+, for which accurate ab initio calculations provide B = 2410.3 MHz. We also report for the first time in a cold starless core the detection of the C3H+ cation. The column densities we derive for C5H+ and C3H+ are (8.8 ± 0.5)×1010 cm-2 and (2.4 ± 0.2)×1010 cm-2, respectively. Hence, the C5H+/C3H+ abundance ratio is 3.7 ± 0.5. The fact that C5H+ is more abundant than C3H+ is well explained by dedicated chemical models and is due to the slow reactivity of C5H+ with H2, while C3H+ reacts with H2. | Descripción: | 5 pags., 3 figs., 2 tabs. | Versión del editor: | http://dx.doi.org/10.1051/0004-6361/202142992 | URI: | http://hdl.handle.net/10261/278048 | DOI: | 10.1051/0004-6361/202142992 | Identificadores: | doi: 10.1051/0004-6361/202142992 issn: 1432-0746 |
Aparece en las colecciones: | (CFMAC-IFF) Artículos |
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Discovery of C5H.pdf | 297,88 kB | Adobe PDF | Visualizar/Abrir |
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