2015A&A...579L...1Z -
Astronomy and Astrophysics, volume 579, L1-1 (2015/7-1)
Mercapto radical (SH) in translucent interstellar clouds.
ZHAO D., GALAZUTDINOV G.A., LINNARTZ H. and KRELOWSKI J.
Abstract (from CDS):
We present the first detection of rotationally resolved electronic transitions of the mercapto radical (SH) in the near-ultraviolet in translucent interstellar clouds. Observational data acquired by the Ultraviolet and Visual Echelle Spectrograph of the Very Large Telescope were used to search for the near-ultraviolet absorption spectra of SH. Two weak absorption features at ∼3242.40 and 3240.66Å, assigned as the pP11(3/2) and the (qP21(3/2)+qQ11(3/2)) doublet transitions in the A2Σ+-X2Π (0, 0) band of SH, respectively, were identified in the averaged spectrum of four selected lines of sight: HD73882, HD 78344, HD 80077, and HD 154368. These features are weak, but can be identified within a 3σ detection limit, and are found in other published data sets as well. We compiled a set of line positions and oscillator strengths of SH to facilitate the data analysis. We derived an averaged value of the SH column density, ∼1.5±0.3x1013cm–2, that is most likely representative for the magnitude of SH column densities in individual SH-rich translucent clouds. This value is also consistent with predictions from models for C-type shocks and turbulent dissipation regions with typical translucent cloud conditions.
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Journal keyword(s):
ISM: clouds - ISM: molecules - ISM: lines and bands - ultraviolet: ISM
Simbad objects:
4
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