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Title:
Detection of the Carbon Chain Negative Ion C8H- in TMC-1
Authors:
Brünken, S.; Gupta, H.; Gottlieb, C. A.; McCarthy, M. C.; Thaddeus, P.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; and School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA 02138; , , , , .), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; and School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA 02138; , , , , .; Also at Institute for Theoretical Chemistry, Departments of Chemistry and Biochemistry, University of Texas at Austin, Austin, TX 78712.), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; and School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA 02138; , , , , .), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; and School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA 02138; , , , , .), AE(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; and School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA 02138; , , , , .)
Publication:
The Astrophysical Journal, Volume 664, Issue 1, pp. L43-L46. (ApJL Homepage)
Publication Date:
07/2007
Origin:
UCP
ApJ Keywords:
ISM: Molecules, Line: Identification, Molecular Data, Molecular Processes, Radio Lines: ISM
DOI:
10.1086/520703
Bibliographic Code:
2007ApJ...664L..43B

Abstract

The negative molecular ion C8H- has been detected in the Galactic molecular source TMC-1. Four rotational transitions have been observed in the centimeter-wave band with the NRAO 100 m Green Bank Telescope (GBT) at precisely the frequencies calculated from the recent laboratory spectroscopy of this large carbon chain anion. C8H- is about 5% as abundant as C8H, or somewhat more than C6H- relative to C6H (1.6%). Improved values of the column densities of C6H- and C6H, and an upper limit for the abundance of the smaller carbon chain C4H- of 0.014% with respect to C4H, have also been determined.
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