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We have made the first detections of the 88 micron [OIII] line from galaxiesin the early Universe, detecting the line from the lensed AGN/starburstcomposite systems APM 08279+5255 at z = 3.911 and SMM J02399-0136 at z =2.8076. The line is exceptionally bright from both systems, with apparent(lensed) luminosities ~10^11 L_solar. For APM 08279, the [OIII] line flux canbe modeled in a star formation paradigm, with the stellar radiation fielddominated by stars with effective temperatures, Teff >36,000 K, similar to thestarburst found in M82. The model implies ~35% of the total far-IR luminosityof the system is generated by the starburst, with the remainder arising fromdust heated by the AGN. The 88 micron line can also be generated in the narrowline region of the AGN if gas densities are around a few 1000 cm-3. For SMMJ02399 the [OIII] line likely arises from HII regions formed by hot (Teff>40,000 K) young stars in a massive starburst that dominates the far-IRluminosity of the system. The present work demonstrates the utility of the[OIII] line for characterizing starbursts and AGN within galaxies in the earlyUniverse. These are the first detections of this astrophysically important linefrom galaxies beyond a redshift of 0.05.

First Detection of the [OIII] 88 micron Line at High Redshifts: Characterizing the Starburst and Narrow Line Regions in Extreme Luminosity Systems