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We investigate the effect of observational constraints such assignal-to-noise, resolution and column density level on the HI morphologicalasymmetry ($\mathrm{A}_\mathrm{mod}$) and the effect of noise on the HI globalprofile ($\mathrm{A}_\mathrm{flux}$) asymmetry indices. Using mock galaxiesfrom the EAGLE simulations we find an optimal combination of the observationalconstraints that are required for robust measurement of the$\mathrm{A}_\mathrm{mod}$ value of a galaxy: a column density threshold of$5\times10^{19}cm^{-2}$ or lower at a minimal signal-to-noise of 3 and a galaxyresolved with at least 11 beams. We also use mock galaxies to investigate theeffect of noise on the $\mathrm{A}_\mathrm{flux}$ values and conclude that aglobal profile with signal-to-noise ratio greater than 5.5 is required toachieve a robust measurement of asymmetry. We investigate the relation between$\mathrm{A}_\mathrm{mod}$ and $\mathrm{A}_\mathrm{flux}$ indices and find themto be uncorrelated which implies that $\mathrm{A}_\mathrm{flux}$ values cannotbe used to predict morphological asymmetries in galaxies.

Using EAGLE simulations to study the effect of observational constraints on the determination of HI asymmetries in galaxies