Detection of extragalactic argonium, ArH + , toward PKS 1830-211

  title={Detection of extragalactic argonium, ArH + , toward PKS 1830-211},
  author={Holger S. P. Muller and S{\'e}bastien Muller and Peter Schilke and Edwin Anthony Bergin and John H. Black and Maryvonne Gerin and Dariusz C. Lis and David A. Neufeld and Sumeyye Suri},
  journal={Astronomy and Astrophysics},
Context. Argonium has recently been detected as a ubiquitous molecule in our Galaxy. Model calculations indicate that its abundance peaks at molecular fractions in the range of 10^(-4) to 10^(-3) and that the observed column densities require high values of the cosmic ray ionization rate. Therefore, this molecular cation may serve as an excellent tracer of the very diffuse interstellar medium (ISM), as well as an indicator of the cosmic ray ionization rate. Aims. We attempted to detect ArH+ in… 

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