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We report the detection of 158 micron [CII] fine-structure line emission fromMIPS J142824.0+352619, a hyperluminous (L_IR ~ 10^13 L_sun) starburst galaxy atz=1.3. The line is bright, and corresponds to a fraction L_[CII]/L_FIR = 2 x10^-3 of the far-IR (FIR) continuum. The [CII], CO, and FIR continuum emissionmay be modeled as arising from photodissociation regions (PDRs) that have acharacteristic gas density of n ~ 10^4.2 cm^-3, and that are illuminated by afar-UV radiation field ~10^3.2 times more intense than the local interstellarradiation field. The mass in these PDRs accounts for approximately half of themolecular gas mass in this galaxy. The L_[CII]/L_FIR ratio is higher thanobserved in local ULIRGs or in the few high-redshift QSOs detected in [CII],but the L_[CII]/L_FIR and L_CO/L_FIR ratios are similar to the values seen innearby starburst galaxies. This suggests that MIPS J142824.0+352619 is ascaled-up version of a starburst nucleus, with the burst extended over severalkiloparsecs.

Detection of the 158 micron [CII] Transition at z=1.3: Evidence for a Galaxy-Wide Starburst