2010A&A...517L...2A


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.16CEST18:17:30

2010A&A...517L...2A - Astronomy and Astrophysics, volume 517, L2-2 (2010/7-1)

Astronomical identification of CN, the smallest observed molecular anion.

AGUNDEZ M., CERNICHARO J., GUELIN M., KAHANE C., ROUEFF E., KLOS J., AOIZ F.J., LIQUE F., MARCELINO N., GOICOECHEA J.R., GONZALEZ GARCIA M., GOTTLIEB C.A., McCARTHY M.C. and THADDEUS P.

Abstract (from CDS):

We present the first astronomical detection of a diatomic negative ion, the cyanide anion CN, and quantum mechanical calculations of the excitation of this anion by means of collisions with para-H2. The anion CN is identified by observing the J=2-1 and J=3-2 rotational transitions in the C-star envelope IRC +10216 with the IRAM 30-m telescope. The U-shaped line profiles indicate that CN, like the large anion C6H, is formed in the outer regions of the envelope. Chemical and excitation model calculations suggest that this species forms from the reaction of large carbon anions with N atoms, rather than from the radiative attachment of an electron to CN, as is the case for large molecular anions. The unexpectedly high abundance derived for CN, 0.25% relative to CN, indicates that its detection in other astronomical sources is likely. A parallel search for the small anion C2H remains inconclusive, despite the previous tentative identification of the J=1-0 rotational transition. The abundance of C2H in IRC +10216 is found to be vanishingly small, <0.0014% relative to C2H.

Abstract Copyright:

Journal keyword(s): astrochemistry - line: identification - molecular processes - stars: AGB and post-AGB - circumstellar matter - stars: individual: IRC +10216

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           ~ 258 0
2 LDN 1527 DNe 04 39 53 +25 45.0           ~ 495 0
3 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1359 0
4 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 716 0
5 QSO J0854+2006 BLL 08 54 48.8749311881 +20 06 30.642936668   15.91 15.43 15.56   ~ 2001 1
6 IRC +10216 C* 09 47 57.40632 +13 16 43.5648     10.96     C9,5e 2135 0

    Equat.    Gal    SGal    Ecl

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2020.07.16-18:17:30

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