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We present ALMA observations of a merging system at z ~ 4.57, observed as apart of the ALMA Large Program to INvestigate [CII] at Early times (ALPINE)survey. Combining ALMA [CII] 158 micron and far-infrared continuum data withmulti-wavelength ancillary data we find that the system is composed of twomassive (Mstar >~ 10^10 Msun) star-forming galaxies experiencing a major merger(stellar mass ratio r_mass ~ 0.9) at close spatial (~13 kpc; projected) andvelocity (delta_v < 300 km/s) separations, and two additional faint narrow[CII]-emitting satellites. The overall system belongs to a larger-scaleprotocluster environment and is coincident to one of its overdensity peaks.ALMA reveals also the presence of [CII] emission arising from a circumgalacticgas structure, extending up to a diameter-scale of ~30 kpc. Our morpho-spectraldecomposition analysis shows that about 50% of the total flux resides betweenthe individual galaxy components, in a metal-enriched gaseous envelopecharacterized by a disturbed morphology and complex kinematics. Similarly toobservations of shock-excited [CII] emitted from tidal tails in local groups,our results can be interpreted as a possible signature of interstellar gasstripped by strong gravitational interactions, with a possible contributionfrom material ejected by galactic outflows and emission triggered by starformation in small faint satellites. Our findings suggest that mergers could bean efficient mechanism of gas mixing in the circumgalactic medium around high-zgalaxies, and thus play a key role in the galaxy baryon cycle at early epochs.

The ALPINE-ALMA [CII] Survey: CGM pollution and gas mixing by tidal stripping in a merging system at z~4.57