Detection of ${}^{13}C$ Isotopic Species of $H{C}_{7}N$

Abstract

The ${}^{13}C$ substitutions of molecule $H{C}_{7}N$ 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 $H{C}_{7}N$ 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.

References in corpus (2)

• Detection of HC11N in the Cold Dust Cloud TMC-1
• A 4 - 6 GHz Spectral Scan and 8 - 10 GHz Observations of the Dark Cloud TMC-1

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• Non-Detection of HC${}_{11}$N toward TMC-1: Constraining the Chemistry of Large Carbon-Chain Molecules
• Deep K-band observations of TMC-1 with the Green Bank Telescope: Detection of HC7O, non-detection of HC11N, and a search for new organic molecules
• Detection of HC${}_5$N and HC${}_7$N Isotopologues in TMC-1 with the Green Bank Telescope
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• Implication of Formation Mechanisms of HC5N in TMC-1 as Studied by 13C Isotopic Fractionation
• TMRT Observations of Carbon-chain molecules in Serpens South 1A
• Non-Thermal Continuum toward SGRB2(N-LMH)
• Precise observations of the 12C/13C ratios of HC3N in the low-mass star-forming region L1527
• Search for Diffuse Neutral Hydrogen and HI Clouds in the NGC 2403 Group
• HI Clouds in the M81 Filament as Dark Matter Minihalos--A Phase-Space Mismatch
• The Origin of Neutral Hydrogen Clouds in Nearby Galaxy Groups: Exploring the Range Of Galaxy Interactions