Letter to the Editor
Astronomical detection of the cyanobutadiynyl radical C5N
M. Guélin 1,
N. Neininger 2 and
J. Cernicharo 3
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 state.
Key words: molecular data circumstellar matter ISM: molecules radio lines: stars
© European Southern Observatory (ESO) 1998
Online publication: June 12, 1998