Detection of 13 C Isotopomers of Molecule HC 7
نویسندگان
چکیده
The 13 C substitutions of molecule HC 7 N were observed in TMC-1 using the J = 12 − 11, J = 13 − 12 rotational transitions in the frequency range 12.4 to 13.6 GHz. We present the first detection the 13 C isotopic species of HC 7 N in the interstellar medium, based on the average of a number of weak rotational transitions. This paper describes the calibration and data averaging process that is also used in a search for large cyanopolyyne molecules in TMC-1 using the 100m Robert C. Byrd Green Bank Telescope (GBT). The capabilities of the GBT 11 to 15 GHz observing system are described along with a discussion of numerical methods for averaging observations of a number of weak spectral lines to detect new interstellar molecules.
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