2020A&A...643L...6M

Query : 2020A&A...643L...6M

2020A&A...643L...6M - Astronomy and Astrophysics, volume 643L6-6 (2020/11-1)

Tentative detection of HC₅NH⁺ in TMC-1.

MARCELINO N., AGUNDEZ M., TERCERO B., CABEZAS C., BERMUDEZ C., GALLEGO J.D., DEVICENTE P. and CERNICHARO J.

Abstract (from CDS):

Using the Yebes 40m radio telescope, we report the detection of a series of seven lines harmonically related with a rotational constant B₀=1295.81581±0.00026MHz and a distortion constant D₀=27.3±0.5Hz towards the cold dense cloud TMC-1. Ab initio calculations indicate that the best possible candidates are the cations HC₅NH⁺ and NC₄NH⁺. From a comparison between calculated and observed rotational constants and other arguments based on proton affinities and dipole moments, we conclude that the best candidate for a carrier of the observed lines is the protonated cyanodiacetylene cation, HC₅NH⁺. The HC₅N/HC₅NH⁺ ratio derived in TMC-1 is 240, which is very similar to the HC₃N/HC₃NH⁺ ratio. Results are discussed in the framework of a chemical model for protonated molecules in cold dense clouds.

Abstract Copyright: © ESO 2020

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

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	TMC-1	MoC	04 41 45.9	+25 41 27						~	1872	0

Query : 2020A&A...643L...6M

Basic data :

TMC-1 -- Molecular Cloud
Other object types:	`PoC (MLB,[MOH94])`, `MoC (TMC)`, `Cld (HCL)`
ICRS coord. (ep=J2000) :	`04 41 45.9 +25 41 27 [ ] D 1983ApJ...264..517M`
FK4 coord. (ep=B1950 eq=1950) :	`04 38 42.0 +25 35 45 [ ]`
Gal coord. (ep=J2000) :	`174.3852 -13.4312 [ ]`

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HCL 2 MLB 3-28 TMC-1 [MOH94] 6

References (1872 between 1850 and 2026) (Total 1872)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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