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We have detected the 158 {\mu}m [CII] line from 12 galaxies at z~1-2. This isthe first survey of this important starformation tracer at redshifts coveringthe epoch of maximum star-formation in the Universe and quadruples the numberof reported high z [CII] detections. The line is very luminous, between<0.024-0.65% of the far-infrared continuum luminosity of our sources, andarises from PDRs on molecular cloud surfaces. An exception is PKS 0215+015,where half of the [CII] emission could arise from XDRs near the central AGN.The L[CII] /LFIR ratio in our star-formation-dominated systems is ~8 timeslarger than that of our AGN-dominated systems. Therefore this ratio selects forstar-formation-dominated systems. Furthermore, the L[CII]/LFIR andL[CII]/L(CO(1-0)) ratios in our starforming galaxies and nearby starburstgalaxies are the same, so that luminous starforming galaxies at earlier epochs(z~1-2) appear to be scaled up versions of local starbursts entailingkilo-parsec-scale starbursts. Most of the FIR and [CII] radiation from ourAGN-dominated sample (excepting PKS 0215+015) also arises from kpc scalestarformation, but with far-UV radiation fields ~8 times more intense than inour star-formation-dominated sample. We speculate that the onset of AGNactivity stimulates large-scale star-formation activity within AGN-dominatedsystems. This idea is supported by the relatively strong [OIII] line emission,indicating very young stars, that was recently observed in high z compositeAGN/starburst systems. Our results confirm the utility of the [CII] line, andin particular, the L[CII]/L(FIR) and L[CII]/LCO(1-0) ratios as a tracers ofstar-formation in galaxies at high redshifts.

A 158 Micron [CII] Line Survey of Galaxies at z ~ 1 to 2: An Indicator of Star Formation in the Early Universe