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A Comparison of c-C3H2 and l-C3H2 in the Spiral Arm Clouds

Kulczak-Jastrzębska M., Lis D., Gerin M.

Acta Astronomica

2012

Vol. 62, No. 3

313--321

Using the IRAM 30-m telescope, we observed molecular absorption lines from c-C3H2 produced in diffuse clouds toward the high-mass star forming regions W51 e1/e2 and W49N to determine the abundance ratio between the cyclic and linear isomers of C3H2 (Nc/Nl). The abundance ratio is found to be 3-5 in the sources where l-C3H2 was previously detected. A possible source of uncertainty in the determination of Nc/Nl is related to the estimate of N(c-C3H2). The main goal of this paper is verification of this hypothesis.