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Title:
Detection of C3 in Diffuse Interstellar Clouds
Authors:
Maier, John P.; Lakin, Nicholas M.; Walker, Gordon A. H.; Bohlender, David A.
Affiliation:
AA(Institute for Physical Chemistry, Klingelbergstrasse 80, University of Basel, CH-4053 Basel, Switzerland; ; Visiting Astronomer, Canada-France-Hawaii Telescope, operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique of France, and the University of Hawaii.), AB(Institute for Physical Chemistry, Klingelbergstrasse 80, University of Basel, CH-4053 Basel, Switzerland; ), AC(Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z1, Canada; ), AD(National Research Council of Canada, Herzberg Institute of Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7, Canada; )
Publication:
The Astrophysical Journal, Volume 553, Issue 1, pp. 267-273. (ApJ Homepage)
Publication Date:
05/2001
Origin:
UCP
ApJ Keywords:
ISM: Molecules
DOI:
10.1086/320668
Bibliographic Code:
2001ApJ...553..267M

Abstract

The smallest polyatomic carbon chain, C3, has been identified in interstellar clouds (Av~1 mag) toward ζ Ophiuchi, 20 Aquilae, and ζ Persei by detection of the origin band in its A1Πu- X1Σ+g electronic transition, near 4052 Å. Individual rotational lines were resolved up to J=30, allowing the rotational-level column densities and temperature distributions to be determined. The inferred limits for the total column densities (~1-2×1012 cm-2) offer a strong incentive to laboratory and astrophysical searches for the longer carbon chains. Concurrent searches for C+2, C-2, and C-3 were negative, but provide sensitive estimates for their maximum column densities.
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