Tentative detection of the CS(+) molecular ion in diffuse interstellar clouds

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Spectroscopy, Carbon Compounds, Interstellar Matter, Molecular Clouds, Molecular Ions, Sulfides, Absorption Spectra, Abundance, Background Radiation, Interstellar Chemistry, Line Spectra, Molecular Spectra, Visible Spectrum

Scientific paper

The authors suggest the discovery of the CS+ molecular ion observed in absorption in the diffuse interstellar clouds on the ζ Oph and δ Sco lines of sight. Synthetic spectra seem to favor a rotational excitation of the (3,0) band of the A2π1/2 - X2Σ+ transition by the cosmological radiation background. This is the first sulphur-bearing molecule detected in diffuse clouds.

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