Detection of isocyanoacetylene HCCNC in TMC-1

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Abstract

The detection is reported of the linear HCCNC molecule, an isomer of cyanoacetylene HCCCN, in TMC-1 with the Nobeyama 45-m telescope using recent laboratory data reported by Krueger (1991). Molecular line data in the frequency range of 9-115 GHz are obtained in order to study the whole dark-cloud molecular abundance and chemistry. The frontends used in the 40- and 89-GHz regions were an SIS receiver and a cooled Schottky diode receiver, respectively, with single-sideband filters. A single line was detected at 39742.6 MGz in March 1986 with an antenna temperature of 0.33 K, which could not be assigned to any transitions of known molecules. In the line survey data, an unidentified line at 49677.9 MHz, which had been observed in February 1985, was also detected. The column density of HCCNC in TMC-1 is determined to be 2.9(0.2) x 10 exp 12/sq cm, which is 20-60 times smaller than that of HCCCN.

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