A 8.8–50 GHz Complete Spectral Line Survey toward TMC-1 I. Survey Data

We completed the first spectral line survey toward a cold, dark cloud TMC-1 (cyanopolyyne peak) in a frequency range between 8.8 and 50.0 GHz by the 45-m radio telescope of Nobeyama Radio Observatory. We detected 414 lines of 38 molecular species including 11 new molecules, such as C₆H, CCO, C₃O, CCS, C₃S, HNCCC, HCCNC, HC₃NH⁺, HCCCHO, CH₂CN, and cyclic C₃H (c-C₃H), which were previously reported; only one significant line, U49536, remains unidentified. 177 out of 414 lines are reported for the first time. Some half of the detected molecules are linear carbon-chain species and their derivatives. We also discovered three new rarer isotopomers: CC34 S, C₃{{34} S}$, and HDCS. Spectral charts are presented together with the observed line parameters of all detected lines. Improved molecular constants of several carbon-chain molecules obtained during the course of identification are also presented.