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Observations have revealed that disturbances in the cold neutral atomichydrogen (HI) in galaxies are ubiquitous, but the reasons for thesedisturbances remain unclear. While some studies suggest that asymmetries inintegrated HI spectra (global HI asymmetry) are higher in HI-rich systems,others claim that they are preferentially found in HI-poor galaxies. In thiswork, we utilise the ALFALFA and xGASS surveys, plus a sample of post-mergergalaxies, to clarify the link between global HI asymmetry and the gasproperties of galaxies. Focusing on star-forming galaxies in ALFALFA, we findthat elevated global HI asymmetry is not associated with a change in the HIcontent of a galaxy, and that only the galaxies with the highest global HIasymmetry show a small increase in specific star-formation rate (sSFR).However, we show that the lack of a trend with HI content is because ALFALFAmisses the gas-poor tail of the star-forming main-sequence. Using xGASS toobtain a sample of star-forming galaxies that is representative in both sSFRand HI content, we find that global HI asymmetric galaxies are typically moregas-poor than symmetric ones at fixed stellar mass, with no change in sSFR. Ourresults highlight the complexity of the connection between galaxy propertiesand global HI asymmetry. This is further confirmed by the fact that evenpost-merger galaxies show both symmetric and asymmetric HI spectra,demonstrating that merger activity does not always lead to an asymmetric globalHI spectrum.

On the relationship between gas content, star-formation, and global HI asymmetry of galaxies on the star-forming main-sequence