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Astron. Astrophys. 335, L1-L4 (1998)

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Letter to the Editor

Astronomical detection of the cyanobutadiynyl radical C5N

M. Guélin 1, N. Neininger 2 and J. Cernicharo 3

1 IRAM, 300 Rue de la Piscine, F-38406 St Martin d'Hères, France
2 Radioastronomisches Institut der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany
3 Instituto de Estructura de la Materia, Madrid, Spain

Received 24 March 1998 / Accepted 5 May 1998


We report the detection of the elusive carbon-chain radical C5 N in the dark cloud TMC1 and its tentative detection in the circumstellar envelope IRC+10216. C5 N appears to be two orders of magnitude less abundant than the related molecule HC5 N and much less abundant than expected from current gas phase chemistry models. In comparison the HC3 N to C3 N abundance ratio is of the order of 10, in reasonable agreement with model predictions.

We have also detected in IRC+10216 two lines arising from the C3 H radical in its excited [FORMULA] state.

Key words: molecular data – circumstellar matter – ISM: molecules – radio lines: stars

SIMBAD Objects


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© European Southern Observatory (ESO) 1998

Online publication: June 12, 1998