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We report the first detection of interstellar mercapto radicals, obtainedalong the sight-line to the submillimeter continuum source W49N. We have usedthe GREAT instrument on SOFIA to observe the 1383 GHz Doublet Pi 3/2 J = 5/2 -3/2 lambda doublet in the upper sideband of the L1 receiver. The resultantspectrum reveals SH absorption in material local to W49N, as well as inforeground gas, unassociated with W49N, that is located along the sight-line.For the foreground material at velocities in the range 37 - 44 km/s withrespect to the local standard of rest, we infer a total SH column density ~ 2.6E+12 cm-2, corresponding to an abundance of ~ 7 E-9 relative to H2, andyielding an SH/H2S abundance ratio ~ 0.13. The observed SH/H2S abundance ratiois much smaller than that predicted by standard models for the production of SHand H2S in turbulent dissipation regions and shocks, and suggests that theendothermic neutral-neutral reaction SH + H2 -> H2S + H must be enhanced alongwith the ion-neutral reactions believed to produce CH+ and SH+ in diffusemolecular clouds.

Discovery of interstellar mercapto radicals (SH) with the GREAT instrument on SOFIA