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We report new deep ALMA observations aimed at investigating the [CII]158umline and continuum emission in three spectroscopically confirmed Lyman BreakGalaxies at 6.8<z<7.1, i.e. well within the re-ionization epoch. With StarFormation Rates of SFR ~ 5-15 Msun/yr these systems are much morerepresentative of the high-z galaxy population than other systems targeted inthe past by millimeter observations. For the galaxy with the deepestobservation we detect [CII] emission at redshift z=7.107, fully consistent withthe Lyalpha redshift, but spatially offset by 0.7" (4 kpc) from the opticalemission. At the location of the optical emission, tracing both the Lyalphaline and the far-UV continuum, no [CII] emission is detected in any of thethree galaxies, with 3sigma upper limits significantly lower than the [CII]emission observed in lower reshift galaxies. These results suggest thatmolecular clouds in the central parts of primordial galaxies are rapidlydisrupted by stellar feedback. As a result, [CII] emission mostly arises frommore external accreting/satellite clumps of neutral gas. These findings are inagreement with recent models of galaxy formation. Thermal far-infraredcontinuum is not detected in any of the three galaxies. However, the upperlimits on the infrared-to-UV emission ratio do not exceed those derived inmetal- and dust-poor galaxies.

The assembly of "normal" galaxies at z=7 probed by ALMA