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The scatter in the relationship between the strength of [CII] 158$\mu$memission and the star formation rate at high-redshift has been the source ofmuch recent interest. Although the relationship is well-established locally,several intensely star-forming galaxies have been found whose [CII] 158$\mu$memission is either weak, absent or spatially offset from the young stars. Herewe present new ALMA data for the two most distant, gravitationally-lensed andspectroscopically-confirmed galaxies, A2744\_YD4 at $z=$8.38 and MACS1149\_JD1at $z=$9.11, both of which reveal intense [OIII] 88$\mu$m emission. In bothcases we provide stringent upper limits on the presence of [CII] 158$\mu$m withrespect to [OIII] 88$\mu$m. We review possible explanations for this apparentredshift-dependent [CII] deficit in the context of our recent hydrodynamicalsimulations. Our results highlight the importance of using several emissionline diagnostics with ALMA to investigate the nature of the interstellar mediumin early galaxies.

The Absence of [CII] 158$\mu$m Emission in Spectroscopically-Confirmed Galaxies at $z>8$