2020A&A...641L...9C


Query : 2020A&A...641L...9C

2020A&A...641L...9C - Astronomy and Astrophysics, volume 641, L9-9 (2020/9-1)

Interstellar nitrile anions: Detection of C3N and C5N in TMC-1.

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

Abstract (from CDS):

We report on the first detection of C3N and C5N towards the cold dark core TMC-1 in the Taurus region, using the Yebes 40 m telescope. The observed C3N/C3N and C5N/C5N abundance ratios are ∼140 and ∼2, respectively; that is similar to those found in the circumstellar envelope of the carbon-rich star IRC +10216. Although the formation mechanisms for the neutrals are different in interstellar (ion-neutral reactions) and circumstellar clouds (photodissociation and radical-neutral reactions), the similarity of the C3N/C3N and C5N/C5N abundance ratios strongly suggests a common chemical path for the formation of these anions in interstellar and circumstellar clouds. We discuss the role of radiative electronic attachment, reactions between N atoms and carbon chain anions Cn, and that of H reactions with HC3N and HC5N as possible routes to form CnN. The detection of C5N in TMC-1 gives strong support for assigning to this anion the lines found in IRC +10216, as it excludes the possibility of a metal-bearing species, or a vibrationally excited state. New sets of rotational parameters have been derived from the observed frequencies in TMC-1 and IRC +10216 for C5N and the neutral radical C5N.

Abstract Copyright: © ESO 2020

Journal keyword(s): astrochemistry - ISM: lines and bands - ISM: molecules - ISM: individual objects: TMC-1 - molecular data

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 LDN 1527 DNe 04 39 53 +25 45.0           ~ 584 0
2 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4096 0
3 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1567 0
4 IRC +10216 C* 09 47 57.40632 +13 16 43.5648           C9,5e 2275 0

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2023.02.01-19:04:41

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