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We present kpc-scale ALMA and HST imaging of the quasar PJ308-21 at$z$=$6.2342$, tracing dust, gas (via the [CII] 158 $\mu$m line) and youngstars. At a resolution of $\sim0.3''$ ($\approx1.7$ kpc), the system isresolved over $>4''$ ($>$20 kpc). In particular, it features a main component,identified to be the quasar host galaxy, centered on the accreting supermassiveblack hole; and two other extended components on the West and East side, oneredshifted and the other blueshifted relative to the quasar. The [CII] emissionof the entire system stretches over $>$1500 km/s along the line of sight. Allthe components of the system are observed in dust, [CII], and rest-frame UVemission. The inferred [CII] luminosities [(0.9-4.6)$\times 10^9$ L$_\odot$],dust luminosities [(0.15-2.6)$\times10^{12}$ L$_\odot$], and rest-frame UVluminosities [(6.6-15)$\times10^{10}$ L$_\odot$], their ratios, and the impliedgas/dust masses and star formation rates [11-290 M$_\odot$ yr$^{-1}$] aretypical of high-redshift star-forming galaxies. A toy model of a singlesatellite galaxy that is tidally stripped by the interaction with the quasarhost galaxy can account for the observed velocity and spatial extent of the twoextended components. An outflow interpretation of the unique features inPJ308-21 is not supported by the data. PJ308-21 is thus one of the earliestgalaxy mergers imaged at cosmic dawn.

ALMA and HST kiloparsec-scale imaging of a quasar-galaxy merger at $z\approx 6.2$