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The detection of the sulfanylium cation, SH+, was reported in 2011 by
Menten et al. using the 12m
Atacama Pathfinder Experiment
radio telescope, a prototype for the 54 12m antennas that are part of the operational
ALMA observatory (which also
includes twelve 7m antennas). SH+ was detected toward
Sgr B2 by means of
a quartet of hyperfine structure lines near
683 GHz. Confirmation quickly followed the initial detection, with observations toward multiple star-forming
regions by Godard et al., toward the
Orion bar by Nagy et al., and
toward the quasar PKS 1830-211 by
Muller et al. this year.
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