Molecular absorption lines toward star-forming regions: a comparative study of HCO+, HNC, HCN, and CN

@article{Godard2010MolecularAL,
  title={Molecular absorption lines toward star-forming regions: a comparative study of HCO+, HNC, HCN, and CN},
  author={Benjamin Godard and E. Falgarone and Maryvonne Gerin and Pierre Hily-Blant and Massimo De Luca},
  journal={Astronomy and Astrophysics},
  year={2010},
  volume={520}
}
Aims. The comparative study of several molecular species at the origin of the gas phase chemistry in the diffuse interstellar medium (ISM) is a key input in unraveling the coupled chemical and dynamical evolution of the ISM. Methods. The lowest rotational lines of HCO + , HCN, HNC, and CN were observed at the IRAM-30m telescope in absorption against the λ 3m m andλ1.3 mm continuum emission of massive star-forming regions in the Galactic plane. The absorption lines probe the gas over kiloparsecs… 
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