A 60-hot-core ALMA survey finds that vibrationally excited HC3N lines are excited mainly by mid-infrared pumping rather than by collisions, and that higher column densities enable more excited states.
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The ALMA-ATOMS survey: Vibrationally excited HC$_3$N lines in hot cores
A 60-hot-core ALMA survey finds that vibrationally excited HC3N lines are excited mainly by mid-infrared pumping rather than by collisions, and that higher column densities enable more excited states.