Anomalous absorption in c-C3H and c-C3D radicals

Details Anomalous absorption in c-C3H and c-C3D radicals Anomalous absorption in c-C3H and c-C3D radicals

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007a%26a...467..371c&link_type=abstract

Astronomy and Astrophysics, Volume 467, Issue 1, May III 2007, pp.371-374

Astronomy and Astrophysics

Astrophysics

4

Ism: Molecules, Molecular Data

Scientific paper

Context: The c-C3H radical was first detected in TMC-1 by Yamamoto et al. (1987, ApJ, 322, L55), who observed the 2{12} → 1{11} transition at 91.5 GHz in emission. Mangum & Wootten (1990, A&A, 239, 319) observed the 1{10} → 1{11} transition at 14.8 GHz in emission in 12 additional galactic objects. Aims: The aim of this investigation is a quantitative estimate of relative line intensities under NLTE conditions. Methods: For wide ranges of physical parameters, where these molecules may be found, we have solved a set of statistical equilibrium equations coupled with the equations of radiative transfer in an on-the-spot approximation. For c-C3H, we accounted for 51 energy levels connected by 207 radiative transitions, and for c-C3D, we accounted for 51 energy levels connected by 205 radiative transitions. Results: Our results show that the 3{31} → 3{30} transition of c-C3H and c-C3D may be found in absorption against the cosmic microwave background (CMB). Furthermore, we found population inversion for the 1{10} → 1{11} transition. These findings may be useful in identifying these molecules in other cosmic objects, as well as for the determination of physical parameters in these objects.
Tables 1-3 and Figs. 4, 5 are only available in electronic form at http://www.aanda.org

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