2021A&A...647L...2C


Query : 2021A&A...647L...2C

2021A&A...647L...2C - Astronomy and Astrophysics, volume 647, L2-2 (2021/3-1)

Discovery of CH2CHCCH and detection of HCCN, HC4N, CH3CH2CN, and, tentatively, CH3CH2CCH in TMC-1.

CERNICHARO J., AGUNDEZ M., CABEZAS C., MARCELINO N., TERCERO B., PARDO J.R., GALLEGO J.D., TERCERO F., LOPEZ-PEREZ J.A. and DE VICENTE P.

Abstract (from CDS):

We present the discovery in TMC-1 of vinyl acetylene, CH2CHCCH, and the detection, for the first time in a cold dark cloud, of HCCN, HC4N, and CH3CH2CN. A tentative detection of CH3CH2CCH is also reported. The column density of vinyl acetylene is (1.2±0.2)x1013cm–2, which makes it one of the most abundant closed-shell hydrocarbons detected in TMC-1. Its abundance is only three times lower than that of propylene, CH3CHCH2. The column densities derived for HCCN and HC4N are (4.4±0.4)x1011cm–2 and (3.7±0.4)x1011cm–2, respectively. Hence, the HCCN/HC4N abundance ratio is 1.2± 0.3. For ethyl cyanide we derive a column density of (1.1±0.3)x1011cm–2. These results are compared with a state-of-the-art chemical model of TMC-1, which is able to account for the observed abundances of these molecules through gas-phase chemical routes.

Abstract Copyright: © ESO 2021

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

Simbad objects: 3

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Number of rows : 3
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           ~ 1559 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2190 1
3 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2264 0

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2022.11.30-11:06:51

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