Detection of Interstellar HC5O in TMC-1 with the Green Bank Telescope

@article{McGuire2017DetectionOI,
  title={Detection of Interstellar HC5O in TMC-1 with the Green Bank Telescope},
  author={Brett A. McGuire and Andrew M. Burkhardt and Christopher N. Shingledecker and Sergei Kalenskii and Eric Herbst and Anthony J. Remijan and Michael C. McCarthy},
  journal={The Astrophysical Journal Letters},
  year={2017},
  volume={843}
}
We report the detection of the carbon-chain radical HC5O for the first time in the interstellar medium toward the cold core TMC-1 using the 100 m Green Bank Telescope. We observe four hyperfine components of this radical in the rotational transition that originates from the fine structure level of its ground state and calculate an abundance of , assuming an excitation temperature of K. No indication of HC3O, HC4O, or HC6O, is found in these or archival observations of the source, while we… 

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