A Monte Carlo radiative transfer code is used to create a model of the dark cloud TMC 1 which is consistent with the detection of five rotational transitions of cyanoacetylene in recent observations. Solutions are given for the interaction between radiative trapping and population equilibrium in the cases of the 15 lowest rotational levels of HC3N, assuming a cylindrical geometry for the source. The model is characterized by a relatively high excitation core and a lower excitation halo. It has proven impossible to fit the observations well without invoking temperature enhancement, in addition to density enhancement, in accounting for the higher excitation of the core.
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Avery et al. (1982) studied this question.
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