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Context: From redshift 6 to redshift $\approx$ 4 galaxies grow rapidly fromlow mass galaxies towards the more mature massive galaxies we see at the cosmicnoon. Growth via gas accretion and mergers undoubtedly shape this evolution -however, there currently exists much uncertainty over the contribution of eachof these processes to the overall evolution of galaxies. Furthermore, previouscharacterisations of the morphology of galaxies in the molecular gas phase hasbeen limited by the coarse resolution of previous observations. Aims: The goalof this paper is to derive the morpho-kinematic properties of 3 main-sequencesystems at $z\sim4.5$, drawn from the ALPINE survey, using brand newhigh-resolution ALMA data in band 7. The objects were previously characterisedas one merger with three components, and and two dispersion-dominated galaxies.Methods: We use intensity and velocity maps, position-velocity diagrams andradial profiles of [CII], in combination with dust continuum maps, to analysethe morphology and kinematics of the 3 systems.} Results: In general, we findthat the high-resolution ALMA data reveal more complex morpho-kinematicproperties. We identify in one galaxy interaction-induced clumps, showing theprofound effect that mergers have on the molecular gas in galaxies, consistentwith what is suggested in recent simulations. A galaxy that was previouslyclassified as dispersion dominated turned out to show two bright [CII] emissionregions, that could either be merging galaxies or massive star-forming regionswithin the galaxy itself. The high resolution data for the other dispersiondominated object also revealed clumps of [CII] that were not previouslyidentified. Within the sample, we might also detect star-formation poweredoutflows (or outflows from Active Galactic Nuclei) which appear to be fuellingdiffuse gas regions and enriching the circumgalactic medium.

The ALMA-ALPINE [CII] survey: sub-kpc morphology of 3 main-sequence galaxy systems at z~4.5 revealed by ALMA