[C II] 158 μm self-absorption and optical depth effects

@article{Guevara2020CI1,
  title={[C II] 158 $\mu$m self-absorption and optical depth effects},
  author={Cristian Guevara and J{\"u}rgen Stutzki and Volker Ossenkopf-Okada and Robert Simon and J. P. P'erez-Beaupuits and Henrik Beuther and Simon Bihr and R. Higgins and Urs U. Graf and Rolf Gusten},
  journal={Astronomy \& Astrophysics},
  year={2020}
}
Context. The [C II] 158 μm far-infrared fine-structure line is one of the most important cooling lines of the star-forming interstellar medium (ISM). It is used as a tracer of star formation efficiency in external galaxies and to study feedback effects in parental clouds. High spectral resolution observations have shown complex structures in the line profiles of the [C II] emission. Aims. Our aim is to determine whether the complex profiles observed in [12C II] are due to individual velocity… 

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