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Detection of a new carbon-chain molecule, CCO
Ohishi, Masatoshi; Suzuki, Hiroko; Ishikawa, Shin-Ichi; Yamada, Chikashi; Kanamori, Hideto; Irvine, William M.; Brown, Ronald D.; Godfrey, Peter D.; Kaifu, Norio
AA(Nobeyama Radio Observatory, Minamimaki, Japan), AB(Nobeyama Radio Observatory, Minamimaki, Japan), AC(Optoelectronics Technology Research Laboratory, Tsukuba, Japan), AD(Tokyo, University, Japan), AE(Massachusetts, University, Amherst), AF(Monash University, Clayton, Australia), AG(Monash University, Clayton, Australia), AH(National Astronomical Observatory, Mitaka, Japan)
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 380, Oct. 10, 1991, p. L39-L42. Research supported by Japan-U.S. Cooperative Science Program and Australian Research Council. (ApJL Homepage)
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NASA/STI Keywords:
Carbon Compounds, Dark Matter, Interstellar Matter, Molecular Clouds, Abundance, Astronomical Spectroscopy, Free Radicals, Radio Sources (Astronomy)
Bibliographic Code:


A new carbon-chain molecule, CCO 3Sigma(-), has been detected in the cold dark molecular cloud TMC-1. The excitation temperature and the column density of CCO are, respectively, about 6 K and about 6 x 10 to the 11th/sq cm. This column density corresponds to a fractional abundance relative to H2 of about 6 x 10 to the -11th. This value is two orders of magnitude less than the abundance of the related carbon-chain molecule CCS, and about half that of C3O. The formation mechanism for CCO is discussed.

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