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Fig. 1

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Portions of the 3 mm line survey of IRC +10216 showing the J = 44−43, J = 45−44, and J = 46−45 lines of C5S. The J = 44−43 line is blended with lines of HC13C13CN and CCCC13CH. The rms noise levels per 1 MHz channel are 0.6, 0.5, and 1.0 mK in the bottom, middle, and top panels, respectively. Note the coincidence in frequency of a weak shoulder at the red part of a SiCN line with the J = 201/2−199 /2 line of C9H (middle panel). Thick gray lines are the calculated line profiles under LTE, assuming that C5S extends between 5 and 20′′ with a homogeneous fractional abundance and rotational temperature of 18 K.

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