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We present a study of six far-infrared fine structure lines in the z=4.225lensed dusty star-forming galaxy SPT0418-47 to probe the physical conditions ofits InterStellar Medium (ISM). In particular, we report Atacama PathfinderEXperiment (APEX) detections of the [OI]145um and [OIII]88um lines and AtacamaCompact Array (ACA) detections of the [NII]122 and 205um lines. The [OI]145um /[CII]158um line ratio is ~5x higher compared to the average of local galaxies.We interpret this as evidence that the ISM is dominated by photo-dissociationregions with high gas densities. The line ratios, and in particular those of[OIII]88um and [NII]122um imply that the ISM in SPT0418-47 is alreadychemically enriched close to solar metallicity. While the strong gravitationalamplification was required to detect these lines with APEX, larger samples canbe observed with the Atacama Large Millimeter/submillimeter Array (ALMA), andshould allow to determine if the observed dense, solar metallicity ISM iscommon among these highly star-forming galaxies.

A dense, solar metallicity ISM in the z=4.2 dusty star-forming galaxy SPT0418-47