title: Detection of a new carbon-chain molecule, CCO.
abstract: We have detected a new carbon-chain molecule, CCO(3 sigma-), in the cold, dark molecular cloud TMC-1.  The excitation temperature and the column density of CCO are, respectively, approximately 6 K and approximately 6 x 10(11) cm-2.  This column density corresponds to a fractional abundance relative to H2 of approximately 6 x 10(-11).  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.
authors.affiliation: Nobeyama Radio Observatory, Nagano, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Ohishi
authors.forename: H
authors.initials: H
authors.lastname: Suzuki
authors.lastname: Ishikawa S-I
authors.forename: C
authors.initials: C
authors.lastname: Yamada
authors.forename: H
authors.initials: H
authors.lastname: Kanamori
authors.forename: W M
authors.initials: WM
authors.lastname: Irvine
authors.forename: R D
authors.initials: RD
authors.lastname: Brown
authors.forename: P D
authors.initials: PD
authors.lastname: Godfrey
authors.forename: N
authors.initials: N
authors.lastname: Kaifu
mesh_terms: D055580:Astronomical Phenomena; D001256:Astronomy; D002244:Carbon / Q000032:analysis* / Q000737:chemistry* / Q000145:classification; D008958:Models, Molecular; D011846:Radio Waves; D016082:Solar System; D013696:Temperature
chemical_list: D002244:Carbon