New ALMA observations in the Horsehead nebula reveal SH+ and CO+ and map S2H, pointing to near-solar sulfur abundance and grain-surface S2H formation.
(2017) (black squares) and the ALMA to- tal power data presented in this work (red squares) assuming a beam-filling factor of
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The sulfur plume in the Horsehead nebula: New detections of S$_2$H, SH$^+$, and CO$^+$
New ALMA observations in the Horsehead nebula reveal SH+ and CO+ and map S2H, pointing to near-solar sulfur abundance and grain-surface S2H formation.