2022A&A...657L..16C


Query : 2022A&A...657L..16C

2022A&A...657L..16C - Astronomy and Astrophysics, volume 657, L16-16 (2022/1-1)

Discovery of C5H+ and detection of C3H+ in TMC-1 with the QUIJOTE line survey.

CERNICHARO J., AGUNDEZ M., CABEZAS C., FUENTETAJA R., TERCERO B., MARCELINO N., ENDO Y., PARDO J.R. and DE VICENTE P.

Abstract (from CDS):

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)x1010 cm–2 and (2.4 ±0.2)x1010 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.

Abstract Copyright: © ESO 2022

Journal keyword(s): molecular data - line: identification - ISM: molecules - ISM: individual objects: TMC-1 - astrochemistry

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1567 0
2 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2275 0
3 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2148 1
4 QSO B1830-211 Bla 18 33 39.9399138048 -21 03 39.368838780     18.70 21   ~ 628 1

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2023.01.31-02:12:39

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