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The global 21 cm HI emission-line profile of a galaxy encodes valuableinformation on the spatial distribution and kinematics of the neutral atomicgas. Galaxy interactions significantly influence the HI disk and imprintobservable features on the integrated HI line profile. In this work, we studythe neutral atomic gas properties of galaxy mergers selected from the GreatObservatories All-sky LIRG Survey. The HI spectra come from new observationswith the Five-hundred-meter Aperture Spherical Telescope and from a collectionof archival data. We quantify the HI profile of the mergers with a newlydeveloped method that uses the curve-of-growth of the line profile. Using acontrol sample of non-merger galaxies carefully selected to match the stellarmass of the merger sample, we show that mergers have a larger proportion ofsingle-peaked HI profiles, as well as a greater tendency for the HI centralvelocity to deviate from the systemic optical velocity of the galaxy. Bycontrast, the HI profiles of mergers are not significantly more asymmetric thanthose of non-mergers.

Massive Galaxy Mergers Have Distinctive Global HI Profiles