Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...467l..37c&link_type=abstract
Astronomy and Astrophysics, Volume 467, Issue 2, May IV 2007, pp.L37-L40
Astronomy and Astrophysics
Astrophysics
62
Stars: Individual: Irc+10216, Stars: Carbon, Radio Lines: Stars, Astrochemistry, Line: Identification, Stars: Agb And Post-Agb
Scientific paper
Aims:Following the recent detection of C6H- in the laboratory and in space we have succeeded in studying the microwave spectrum of C4H^-. We report here the first detection in space of this negative ion. Methods: We have observed in the envelope of the carbon star IRC +10216 five lines corresponding to the J = 9-8, 11-10, 12-11, 14-13 and 15-14 rotational transitions of C4H^-. The C4H- lines have a cusped shape, denoting that this ion is formed in the outer part of the envelope, like its neutral counterpart C4H. Results: The abundance of C4H- in IRC+10216 is 1/6 of the abundance of C6H- and 1/4200 of that of C4H. Conclusions: The detection of C4H^-, after that of C6H^-, confirms the theoretical prediction that C-chain anions are abundant in interstellar clouds and yields a first measurement of the electron radiative attachment rates.
This work was based on observations carried out with the IRAM 30-m telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).
Agúndez Marcelino
Cernicharo Jose
Guélin Michel
Kawaguchi Kentaro
McCarthy Martin
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