Physics – Atomic Physics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ycat..34230235c&link_type=abstract
VizieR On-line Data Catalog: J/A+A/423/235. Originally published in: 2004A&A...423..235C
Physics
Atomic Physics
Atomic Physics, Interstellar Medium
Scientific paper
Laboratory detection of four isomers of C5H2 mol reported by Travers et al. (1997ApJ...483L.135T), McCarthy et al. (1997, Science, 275, 518), and Gottlieb et al. (1998ApJ...509L.141G). They suggested for detection of the ring-chain isomer of C5H2 (c-C5H2) in cosmic objects, as it is the most stable one in comparison to the others. Two transitions 313-212 and 303-202 at 19.147GHz and 19.606GHz, respectively, of c-C5H2 have been detected in TMC-1. We suggest that the c-C5H2 may be identified in cool cosmic objects through its transition 313-404 at 4.3GHz in absorption against the cosmic microwave background. Since in absence of availability of the collisional rates, we have used scaled values for them, we have checked the sensitivity of the lines on the rates by enhancing the rate for the transitions with {Delta}ka=0 by a factor of 10. Though the transitions are not found sensitive, our results ma y be treated as qualitative in nature. This absorption line may play an important role for identification of c-C5H2 in cosmic objects.
(1 data file).
Chandra Sharat
Shine S. A.
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