2015A&A...579L..10A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST02:30:54

2015A&A...579L..10A - Astronomy and Astrophysics, volume 579, L10-10 (2015/7-1)

Probing non-polar interstellar molecules through their protonated form: Detection of protonated cyanogen (NCCNH+).

AGUNDEZ M., CERNICHARO J., DE VICENTE P., MARCELINO N., ROUEFF E., FUENTE A., GERIN M., GUELIN M., ALBO C., BARCIA A., BARBAS L., BOLANO R., COLOMER F., DIEZ M.C., GALLEGO J.D., GOMEZ-GONZALEZ J., LOPEZ-FERNANDEZ I., LOPEZ-FERNANDEZ J.A., LOPEZ-PEREZ J.A., MALO I., SERNA J.M. and TERCERO F.

Abstract (from CDS):

Cyanogen (NCCN) is the simplest member of the series of dicyanopolyynes. It has been hypothesized that this family of molecules can be important constituents of interstellar and circumstellar media, although the lack of a permanent electric dipole moment prevents its detection through radioastronomical techniques. Here we present the first solid evidence of the presence of cyanogen in interstellar clouds by detection of its protonated form toward the cold dark clouds TMC-1 and L483. Protonated cyanogen (NCCNH+) has been identified through the J=5-4 and J=10-9 rotational transitions using the 40 m radiotelescope of Yebes and the IRAM 30 m telescope. We derive beam-averaged column densities for NCCNH+ of (8.6±4.4)x1010cm–2 in TMC-1 and (3.9±1.8)x1010cm–2 in L483, which translate into fairly low fractional abundances relative to H2, in the range (1-10)x10–12. The chemistry of protonated molecules in dark clouds is discussed, and it is found that, in general terms, the abundance ratio between the protonated and non-protonated forms of a molecule increases with increasing proton affinity. Our chemical model predicts an abundance ratio NCCNH+/NCCN of ∼10–4, which implies that the abundance of cyanogen in dark clouds could be as high as (1-10)x10–8 relative to H2, i.e., comparable to that of other abundant nitriles such as HCN, HNC, and HC3N.

Abstract Copyright:

Journal keyword(s): astrochemistry - line: identification - ISM: clouds - ISM: molecules - radio lines: ISM

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 257 0
2 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1359 0
3 V* U Ori Mi* 05 55 49.1689920441 +20 10 30.690374867 6.82 6.39 5.40     M6-9.5e 470 0
4 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2133 0
5 LDN 483 DNe 18 17 35 -04 39.8           ~ 209 0
6 OH 26.5 +0.6 OH* 18 37 32.50920 -05 23 59.1936           ~ 284 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-02:30:54

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